2024年2月20日发(作者：敖浚)
2021年6月大学英语六级阅读理解真题及答案
Questions 21 to 25 are based on the following passage.
In the villages of the English countryside there are still
people who remember the good old days when no one bothered to
lock their doors. There simply wasn’t any crime to worry about.
Amazingly, these happy times appear still to be with us in the
world’s biggest community. A new study by Dan Farmer, a gifted
programmer, using an automated investigative program of his own
called SATAN, shows that the owners of well over half of all
World Wide Web sites have set up home without fitting locks to
their doors.
SATAN can try out a variety of well-known hacking (黑客的)
tricks on an Internet site without actually breaking in. Farmer
has made the program publicly available, amid much criticism.
A person with evil intent could use it to hunt down sites that
are easy to burgle (闯入…...行窃).
But Farmer is very concerned about the need to alert the public
to poor security and, so far, events have proved him right.
SATAN has done more to alert people to the risks than cause new
第 1 页
共 15 页
disorder. So is the Net becoming more secure? Far from it. In
the early days, when you visited a Web site your browser simply
looked at the content. Now the Web is full of tiny programs that
automatically download when you look at a Web page, and run on
your own machine. These programs could, if their authors wished,
do all kinds of nasty things to your computer.
At the same time, the Net is increasingly populated with spiders,
worms, agents and other types of automated beasts designed to
penetrate the sites and seek out and classify information. All
these make wonderful tools for antisocial people who want to
invade weak sites and cause damage.
But let’s look on the bright side. Given the lack of locks,
the Internet is surely the world’s biggest (almost) crime-free
society. Maybe that is because hackers are fundamentally honest.
Or that there currently isn’t much to steal. Or because
vandalism ( 恶意破坏) isn’t much fun unless you have a peculiar
dislike for someone.
Whatever the reason, let’s enjoy it while we can. But expect
it all to change, and security to become the number one issue,
when the most influential inhabitants of the Net are selling
services they want to be paid for.
21. By saying “... owners of well over half of all World Wide
第 2 页
共 15 页
Web sites have set up home without fitting locks to their doors”
(Lines 3-4, Para. 2), the author means that ________.
A) those happy times appear still to be with us
B) there simply wasn’t any crime to worry about
C) many sites are not well-protected
D) hackers try out tricks on an Internet site without actually
breaking in（C）
22. SATAN, a program designed by Dan Fanner can be used ________.
A) to investigate the security of Internet sites
B) to improve the security of the Internet system
C) to prevent hackers from breaking into websites
D) to download useful programs and information（A）
23. Fanner’s program has been criticized by the public because.
A) it causes damage to Net browsers
B) it can break into Internet sites
C) it can be used to cause disorder on all sites
D) it can be used by people with evil intent（D）
24. The author’s attitude toward SATAN is ________.
A) enthusiastic
B) critical
C) positive
D) indifferent（C）
第 3 页
共 15 页
25. The author suggests in the last paragraph that ________.
A) we should make full use of the Internet before security
measures are strengthened
B) we should alert the most influential businessmen to the
importance of security
C) influential businessmen should give priority to the
improvement of Net security
D) net inhabitants should not let security measures affect
their joy of surfing the Internet
Questions 26 to 30 are based on the following passage.
I came away from my years of teaching on the college and
university level with a conviction that enactment (扮演角色),
performance, dramatization are the most successful forms of
teaching. Students must be incorporated, made, so far as
possible, an integral part of the learning process. The notion
that learning should have in it an element of inspired play
would seem to the greater part of the academic establishment
merely silly, but that is nonetheless the case. Of Ezekiel
Cheever, the most famous schoolmaster of the Massachusetts Bay
Colony, his onetime student Cotton Mather wrote that he so
planned his lessons that his pupils “came to work as though
第 4 页
共 15 页
they came to play,” and Alfred North Whitehead, almost three
hundred years later, noted that a teacher should make his/her
students “glad they were there.”
Since, we are told, 80 to 90 percent of all instruction in the
typical university is by the lecture method, we should give
close attention to this form of education. There is, I think,
much truth in Patricia Nelson Limerick’s observation that
“lecturing is an unnatural act, an act for which God did not
design humans. It is perfectly all right, now and then, for a
human to be possessed by the urge to speak, and to speak while
others remain silent. But to do this regularly, one hour and
15 minutes at for one person to drag on while others
sit in silence?... I do not believe that this is what the
designed humans to do.”
The strange, almost incomprehensible fact is that many
professors, just as they feel obliged to write dully, believe
that they should lecture dully. To show enthusiasm is to risk
appearing unscientific, unobjective; it is to appeal to the
students’ emotions rather than their intellect. Thus the ideal
lecture is one filled with facts and read in an unchanged
monotone.
The cult (推崇) of lecturing dully, like the cult of writing
第 5 页
共 15 页
dully, goes back, of course, some years. Edward Shils,
professor of sociology, recalls the professors he encountered
at the University of Pennsylvania in his youth. They seemed “a
priesthood, rather uneven in their merits but uniform in their
bearing; they never referred to anything personal. Some read
from old lecture notes and then haltingly explained the
thumb-worn last lines. Others lectured from cards that had
served for years, to judge by the The teachers
began on time, ended on time, and left the room without saying
a word more to their students, very seldom being detained by
The classes were not large, yet there was no
discussion. No questions were raised in class, and there were
no office hours.”
26. The author believes that a successful teacher should be able
to ________.
A) make dramatization an important aspect of students’
learning
B) make inspired play an integral part of the learning process
C) improve students’ learning performance
D) make study just as easy as play（B）
27. The majority of university professors prefer the
traditional way of lecturing in the belief that ________.
第 6 页
共 15 页
A) it draws the close attention of the students
B) it conforms in a way to the design of the Creator
C) it presents course content in a scientific and objective
manner
D) it helps students to comprehend abstract theories more
easily（C）
28. What the author recommends in this passage is that ________.
A) college education should be improved through radical
measures
B) more freedom of choice should be given to students in their
studies
C) traditional college lectures should be replaced by
dramatized performances
D) interaction should be encouraged in the process of teaching（D）
29. By saying “They seemed ‘a priesthood, rather uneven in
their merits but uniform in ’” (Lines 3-4,
Para. 4), the author means that ________.
A) professors are a group of professionals that differ in their
academic ability but behave in the same way
B) professors are like priests wearing the same kind of black
gown but having different roles to play
第 7 页
共 15 页
C) there is no fundamental difference between professors and
priests though they differ in their merits
D) professors at the University of Pennsylvania used to wear
black suits which made them look like priests（A）
30. Whose teaching method is particularly commended by the
author?
A) Ezekiel Cheever’s.
B) Cotton Mather’s.
C) Alfred North Whitehead’s.
D) Patricia Nelson Limerick’s.
Questions 31 to 35 are based on the following passage.
Take the case of public education alone. The principal
difficulty faced by the schools has been the tremendous
increase in the number of pupils. This has been caused by the
advance of the legal age for going into industry and the
impossibility of finding a job even when the legal age has been
reached. In view of the technological improvements in the last
few years, business will require in the future proportionately
fewer workers than ever before. The result will be still further
raising of he legal age for going into employment, and still
further difficulty in finding employment when hat age has been
第 8 页
共 15 页
attained. If we cannot put our children to work, we must put
them in school.
We may also be quite confident that the present trend toward
a shorter day and a shorter week will be maintained. We have
developed and shall continue to have a new leisure class.
Already the public agencies for adult education are swamped by
the tide that has swept over them since depression began. They
will be little better off when it is over. Their support must
come from the taxpayer.
It is surely too much to hope that these increases in the cost
of public education can be borne by the local communities. They
cannot care for the present restricted and inadequate system.
The local communities have failed in their efforts to cope with
unemployment. They cannot expect to cope with public education
on the scale on which we must attempt it. The answer to the
problem of unemployment has been Federal relief. The answer to
the problem of public education may have to be much the same,
and properly so. If there is one thing in which the citizens
of all parts of the country have an interest, it is in the decent
education of the citizens of all parts of the country. Our
income tax now goes in part to keep our neighbors alive. It may
have to go in part as well to make our neighbors intelligent.
第 9 页
共 15 页
We are now attempting to preserve the present generation
through Federal relief of the destitute (贫民). Only a people
determined to ruin the next generation will refuse such Federal
funds as public education may require.
31. What is the passage mainly about?
A) How to persuade local communities to provide more funds.
B) How to cope with the shortage of funds for public education.
C) How to solve the rising unemployment problem.
D) How to improve the public education system.（B）
32. What is the reason for the increase in the number of students?
A) The requirement of educated workers by business.
B) Raising of the legal age for going to work.
C) The trend toward a shorter workday.
D) People’s concern for the future of the next generation.（B）
33. The public agencies for adult education will be little
better off because ________.
A) the unemployed are too poor to continue their education
B) a new leisure class has developed
C) they are still suffering from the depression
D) an increase in taxes could be a problem（D）
34. According to the author, the answer to the problem of public
第 10 页
共 15 页
education is that the Federal government ________.
A) should allocate Federal funds for public education
B) should demand that local communities provide support
C) should raise taxes to meet the needs of public education
D) should first of all solve the problem of unemployment（A）
35. Why does the author say “Only a people determined to ruin
the next generation will refuse such Federal funds as public
education may require” (Lines 10-11, Para. 3)?
A) Only by appropriating adequate Federal funds for education
can the next generation have a bright future.
B) Citizens of all parts of the country agree that the best way
to support education is to use Federal funds.
C) People all over the country should make contributions to
education in the interest of the next generation.
D) Educated people are determined to use part of the Federal
funds to help the poor.
Questions 36 to 40 are based on the following passage.
A new high-performance contact lens under development at the
department for applied physics at the University of Heidelberg
will not only correct ordinary vision defects but will enhance
normal night vision as much as five times, making people’s
第 11 页
共 15 页
vision sharper than that of cats.
Bille and his team work with an optical instrument called an
active mirror—a device used in astronomical telescopes to spot
newly emerging stars and far distant galaxies. Connected to a
wave-front sensor that tracks and measures the course of a laser
beam into the eye and back, the aluminum mirror detects the
deficiencies of the cornea, the transparent protective layer
covering the lens of the human eye. The highly precise data from
the two instruments—which, Bille hopes, will one day be found
at the opticians (眼镜商) all over the world—serve as a basis
for the production of completely individualized contact lenses
that correct and enhance the wearer’s vision.
By day, Bille’s contact lenses will focus rays of light so
accurately on the retina （视网膜）that the image of a small
leaf or the outline of a far distant tree will be formed with
a sharpness that surpasses that of conventional vision aids by
almost half a diopter ( 屈光度). At night, the lenses have an
even greater potential. “Because the new lens—in contrast to
the already existing ones—also works when it’s dark and the
pupil is wide open,” says Bille, “lens wearers will be able
to identify a face at a distance of 100 meters”—80 meters
farther than they would normally be able to see. In his
第 12 页
共 15 页
experiments night vision was enhanced by an even greater factor:
in semi-darkness, test subjects could see up to 15 times better
than without the lenses.
Bille’s lenses are expected to reach the market in the year
2000, and one tentative plan is to use the Internet to transmit
information on patients’ visual defects from the optician to
the manufacturer, who will then produce and mail the contact
lenses within a couple of days. The physicist expects the lenses
to cost about a dollar a pair, about the same as conventional
one-day disposable lenses.
36. The new contact lens is meant for ________.
A) astronomical observations
B) the night blind
C) those with vision defects
D) optical experiments（C）
37. What do the two instruments mentioned in the second
paragraph (Line 5) refer to?
A) The astronomical telescope and the wave-front sensor.
B) The aluminum mirror and the laser beam.
C) The active mirror and the contact lens.
D) The aluminum mirror and the wave-front sensor.（D）
38. Individualized contact lenses (Line 7, Para. 2) are lenses
第 13 页
共 15 页
designed ________.
A) to work like an astronomical telescope
B) to suit the wearer’s specific needs
C) to process extremely accurate data
D) to test the wearer’s eyesight（B）
39. According to Bille, with the new lenses the wearer’s vision
________.
A) will be far better at night than in the daytime
B) may be broadened about 15 times than without them
C) can be better improved in the daytime than at night
D) will be sharper by a much greater degree at night than in
the daytime（D）
40. Which of the following is true about Bille’s lenses?
A) Their production process is complicated.
B) They will be sold at a very low price.
C) They have to be replaced every day.
D) Purchase orders can be made through the Internet.
21. C 22. A 23. D 24. C 25. A
26. B 27. C 28. D 29. A 30. A
31. B 32. B 33. D 34. A 35. A
36. C 37. D 38. B 39. D 40. D
第 14 页
共 15 页
第 15 页
共 15 页
2024年2月20日发(作者：敖浚)
2021年6月大学英语六级阅读理解真题及答案
Questions 21 to 25 are based on the following passage.
In the villages of the English countryside there are still
people who remember the good old days when no one bothered to
lock their doors. There simply wasn’t any crime to worry about.
Amazingly, these happy times appear still to be with us in the
world’s biggest community. A new study by Dan Farmer, a gifted
programmer, using an automated investigative program of his own
called SATAN, shows that the owners of well over half of all
World Wide Web sites have set up home without fitting locks to
their doors.
SATAN can try out a variety of well-known hacking (黑客的)
tricks on an Internet site without actually breaking in. Farmer
has made the program publicly available, amid much criticism.
A person with evil intent could use it to hunt down sites that
are easy to burgle (闯入…...行窃).
But Farmer is very concerned about the need to alert the public
to poor security and, so far, events have proved him right.
SATAN has done more to alert people to the risks than cause new
第 1 页
共 15 页
disorder. So is the Net becoming more secure? Far from it. In
the early days, when you visited a Web site your browser simply
looked at the content. Now the Web is full of tiny programs that
automatically download when you look at a Web page, and run on
your own machine. These programs could, if their authors wished,
do all kinds of nasty things to your computer.
At the same time, the Net is increasingly populated with spiders,
worms, agents and other types of automated beasts designed to
penetrate the sites and seek out and classify information. All
these make wonderful tools for antisocial people who want to
invade weak sites and cause damage.
But let’s look on the bright side. Given the lack of locks,
the Internet is surely the world’s biggest (almost) crime-free
society. Maybe that is because hackers are fundamentally honest.
Or that there currently isn’t much to steal. Or because
vandalism ( 恶意破坏) isn’t much fun unless you have a peculiar
dislike for someone.
Whatever the reason, let’s enjoy it while we can. But expect
it all to change, and security to become the number one issue,
when the most influential inhabitants of the Net are selling
services they want to be paid for.
21. By saying “... owners of well over half of all World Wide
第 2 页
共 15 页
Web sites have set up home without fitting locks to their doors”
(Lines 3-4, Para. 2), the author means that ________.
A) those happy times appear still to be with us
B) there simply wasn’t any crime to worry about
C) many sites are not well-protected
D) hackers try out tricks on an Internet site without actually
breaking in（C）
22. SATAN, a program designed by Dan Fanner can be used ________.
A) to investigate the security of Internet sites
B) to improve the security of the Internet system
C) to prevent hackers from breaking into websites
D) to download useful programs and information（A）
23. Fanner’s program has been criticized by the public because.
A) it causes damage to Net browsers
B) it can break into Internet sites
C) it can be used to cause disorder on all sites
D) it can be used by people with evil intent（D）
24. The author’s attitude toward SATAN is ________.
A) enthusiastic
B) critical
C) positive
D) indifferent（C）
第 3 页
共 15 页
25. The author suggests in the last paragraph that ________.
A) we should make full use of the Internet before security
measures are strengthened
B) we should alert the most influential businessmen to the
importance of security
C) influential businessmen should give priority to the
improvement of Net security
D) net inhabitants should not let security measures affect
their joy of surfing the Internet
Questions 26 to 30 are based on the following passage.
I came away from my years of teaching on the college and
university level with a conviction that enactment (扮演角色),
performance, dramatization are the most successful forms of
teaching. Students must be incorporated, made, so far as
possible, an integral part of the learning process. The notion
that learning should have in it an element of inspired play
would seem to the greater part of the academic establishment
merely silly, but that is nonetheless the case. Of Ezekiel
Cheever, the most famous schoolmaster of the Massachusetts Bay
Colony, his onetime student Cotton Mather wrote that he so
planned his lessons that his pupils “came to work as though
第 4 页
共 15 页
they came to play,” and Alfred North Whitehead, almost three
hundred years later, noted that a teacher should make his/her
students “glad they were there.”
Since, we are told, 80 to 90 percent of all instruction in the
typical university is by the lecture method, we should give
close attention to this form of education. There is, I think,
much truth in Patricia Nelson Limerick’s observation that
“lecturing is an unnatural act, an act for which God did not
design humans. It is perfectly all right, now and then, for a
human to be possessed by the urge to speak, and to speak while
others remain silent. But to do this regularly, one hour and
15 minutes at for one person to drag on while others
sit in silence?... I do not believe that this is what the
designed humans to do.”
The strange, almost incomprehensible fact is that many
professors, just as they feel obliged to write dully, believe
that they should lecture dully. To show enthusiasm is to risk
appearing unscientific, unobjective; it is to appeal to the
students’ emotions rather than their intellect. Thus the ideal
lecture is one filled with facts and read in an unchanged
monotone.
The cult (推崇) of lecturing dully, like the cult of writing
第 5 页
共 15 页
dully, goes back, of course, some years. Edward Shils,
professor of sociology, recalls the professors he encountered
at the University of Pennsylvania in his youth. They seemed “a
priesthood, rather uneven in their merits but uniform in their
bearing; they never referred to anything personal. Some read
from old lecture notes and then haltingly explained the
thumb-worn last lines. Others lectured from cards that had
served for years, to judge by the The teachers
began on time, ended on time, and left the room without saying
a word more to their students, very seldom being detained by
The classes were not large, yet there was no
discussion. No questions were raised in class, and there were
no office hours.”
26. The author believes that a successful teacher should be able
to ________.
A) make dramatization an important aspect of students’
learning
B) make inspired play an integral part of the learning process
C) improve students’ learning performance
D) make study just as easy as play（B）
27. The majority of university professors prefer the
traditional way of lecturing in the belief that ________.
第 6 页
共 15 页
A) it draws the close attention of the students
B) it conforms in a way to the design of the Creator
C) it presents course content in a scientific and objective
manner
D) it helps students to comprehend abstract theories more
easily（C）
28. What the author recommends in this passage is that ________.
A) college education should be improved through radical
measures
B) more freedom of choice should be given to students in their
studies
C) traditional college lectures should be replaced by
dramatized performances
D) interaction should be encouraged in the process of teaching（D）
29. By saying “They seemed ‘a priesthood, rather uneven in
their merits but uniform in ’” (Lines 3-4,
Para. 4), the author means that ________.
A) professors are a group of professionals that differ in their
academic ability but behave in the same way
B) professors are like priests wearing the same kind of black
gown but having different roles to play
第 7 页
共 15 页
C) there is no fundamental difference between professors and
priests though they differ in their merits
D) professors at the University of Pennsylvania used to wear
black suits which made them look like priests（A）
30. Whose teaching method is particularly commended by the
author?
A) Ezekiel Cheever’s.
B) Cotton Mather’s.
C) Alfred North Whitehead’s.
D) Patricia Nelson Limerick’s.
Questions 31 to 35 are based on the following passage.
Take the case of public education alone. The principal
difficulty faced by the schools has been the tremendous
increase in the number of pupils. This has been caused by the
advance of the legal age for going into industry and the
impossibility of finding a job even when the legal age has been
reached. In view of the technological improvements in the last
few years, business will require in the future proportionately
fewer workers than ever before. The result will be still further
raising of he legal age for going into employment, and still
further difficulty in finding employment when hat age has been
第 8 页
共 15 页
attained. If we cannot put our children to work, we must put
them in school.
We may also be quite confident that the present trend toward
a shorter day and a shorter week will be maintained. We have
developed and shall continue to have a new leisure class.
Already the public agencies for adult education are swamped by
the tide that has swept over them since depression began. They
will be little better off when it is over. Their support must
come from the taxpayer.
It is surely too much to hope that these increases in the cost
of public education can be borne by the local communities. They
cannot care for the present restricted and inadequate system.
The local communities have failed in their efforts to cope with
unemployment. They cannot expect to cope with public education
on the scale on which we must attempt it. The answer to the
problem of unemployment has been Federal relief. The answer to
the problem of public education may have to be much the same,
and properly so. If there is one thing in which the citizens
of all parts of the country have an interest, it is in the decent
education of the citizens of all parts of the country. Our
income tax now goes in part to keep our neighbors alive. It may
have to go in part as well to make our neighbors intelligent.
第 9 页
共 15 页
We are now attempting to preserve the present generation
through Federal relief of the destitute (贫民). Only a people
determined to ruin the next generation will refuse such Federal
funds as public education may require.
31. What is the passage mainly about?
A) How to persuade local communities to provide more funds.
B) How to cope with the shortage of funds for public education.
C) How to solve the rising unemployment problem.
D) How to improve the public education system.（B）
32. What is the reason for the increase in the number of students?
A) The requirement of educated workers by business.
B) Raising of the legal age for going to work.
C) The trend toward a shorter workday.
D) People’s concern for the future of the next generation.（B）
33. The public agencies for adult education will be little
better off because ________.
A) the unemployed are too poor to continue their education
B) a new leisure class has developed
C) they are still suffering from the depression
D) an increase in taxes could be a problem（D）
34. According to the author, the answer to the problem of public
第 10 页
共 15 页
education is that the Federal government ________.
A) should allocate Federal funds for public education
B) should demand that local communities provide support
C) should raise taxes to meet the needs of public education
D) should first of all solve the problem of unemployment（A）
35. Why does the author say “Only a people determined to ruin
the next generation will refuse such Federal funds as public
education may require” (Lines 10-11, Para. 3)?
A) Only by appropriating adequate Federal funds for education
can the next generation have a bright future.
B) Citizens of all parts of the country agree that the best way
to support education is to use Federal funds.
C) People all over the country should make contributions to
education in the interest of the next generation.
D) Educated people are determined to use part of the Federal
funds to help the poor.
Questions 36 to 40 are based on the following passage.
A new high-performance contact lens under development at the
department for applied physics at the University of Heidelberg
will not only correct ordinary vision defects but will enhance
normal night vision as much as five times, making people’s
第 11 页
共 15 页
vision sharper than that of cats.
Bille and his team work with an optical instrument called an
active mirror—a device used in astronomical telescopes to spot
newly emerging stars and far distant galaxies. Connected to a
wave-front sensor that tracks and measures the course of a laser
beam into the eye and back, the aluminum mirror detects the
deficiencies of the cornea, the transparent protective layer
covering the lens of the human eye. The highly precise data from
the two instruments—which, Bille hopes, will one day be found
at the opticians (眼镜商) all over the world—serve as a basis
for the production of completely individualized contact lenses
that correct and enhance the wearer’s vision.
By day, Bille’s contact lenses will focus rays of light so
accurately on the retina （视网膜）that the image of a small
leaf or the outline of a far distant tree will be formed with
a sharpness that surpasses that of conventional vision aids by
almost half a diopter ( 屈光度). At night, the lenses have an
even greater potential. “Because the new lens—in contrast to
the already existing ones—also works when it’s dark and the
pupil is wide open,” says Bille, “lens wearers will be able
to identify a face at a distance of 100 meters”—80 meters
farther than they would normally be able to see. In his
第 12 页
共 15 页
experiments night vision was enhanced by an even greater factor:
in semi-darkness, test subjects could see up to 15 times better
than without the lenses.
Bille’s lenses are expected to reach the market in the year
2000, and one tentative plan is to use the Internet to transmit
information on patients’ visual defects from the optician to
the manufacturer, who will then produce and mail the contact
lenses within a couple of days. The physicist expects the lenses
to cost about a dollar a pair, about the same as conventional
one-day disposable lenses.
36. The new contact lens is meant for ________.
A) astronomical observations
B) the night blind
C) those with vision defects
D) optical experiments（C）
37. What do the two instruments mentioned in the second
paragraph (Line 5) refer to?
A) The astronomical telescope and the wave-front sensor.
B) The aluminum mirror and the laser beam.
C) The active mirror and the contact lens.
D) The aluminum mirror and the wave-front sensor.（D）
38. Individualized contact lenses (Line 7, Para. 2) are lenses
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designed ________.
A) to work like an astronomical telescope
B) to suit the wearer’s specific needs
C) to process extremely accurate data
D) to test the wearer’s eyesight（B）
39. According to Bille, with the new lenses the wearer’s vision
________.
A) will be far better at night than in the daytime
B) may be broadened about 15 times than without them
C) can be better improved in the daytime than at night
D) will be sharper by a much greater degree at night than in
the daytime（D）
40. Which of the following is true about Bille’s lenses?
A) Their production process is complicated.
B) They will be sold at a very low price.
C) They have to be replaced every day.
D) Purchase orders can be made through the Internet.
21. C 22. A 23. D 24. C 25. A
26. B 27. C 28. D 29. A 30. A
31. B 32. B 33. D 34. A 35. A
36. C 37. D 38. B 39. D 40. D
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