[单项选择]This, they say, is proof that the more primitive species was not simply supplanted by an advanced one ______ into one.
A. but also developed
B. but reformed sharply
C. but merely turned
D. but evolved slowly

[单项选择]______ nobody has anything more to say, let's round off the discussion.
A. When
B. While
C. So that
D. Now that

[单项选择]

Scientists say they now have proof to support the old-fashioned advice that it’s best to sleep on a problem. They say sleep strengthens the memory and helps the brain organize the masses of information we receive each day. Lead researcher Bob Stickgold at the Harvard Medical School said, "Sleep helps us draw rules from our experiences. It’s like knowing the difference between dogs and cats. even if it’s hard to explain. " The US research team studied how well students remembered connections between words and symbols (象征) , reports New Scientist. They compared how the students performed if they had had a sleep between seeing the words and having the test, and if they had not slept. They found that people were better able to remember lists of related words after a night’ s sleep than after the same time spent awake during the day. They also found it easier to remember themes (主题) that the words had in common. But they forgot around one in four more
A. pay full attention to a problem
B. wait until later for a decision
C. sleep to forget a problem
D. have difficulty sleeping

[单项选择]The best proof against man's intelligence is that ______.
A. he is greedy and he has a violent hunger for wealth
B. he is cruel and is not above robbing his fellowmen of their possessions
C. he assumes that he is superior to other animals in spite of his past record
D. he is an unreasoning creature

[单项选择]Doctors say that heavy drinkers are generally more susceptible to _________ diseases.
A. powerful
B. infectious
C. influential
D. suspicious

[单项选择]Nobody ______ any more to say, the meeting was closed.
A. had
B. has had
C. having
D. had had

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Some say that nothing is more vivid or memorable than a picture. We disagree. No visual image is as vivid as the image created by the mind in response to words. The main function of the poet or the artist, in fact, is to enable people to see more deeply into things than they can with the unaided eye, and this is what good prose or poetry or painting is all about.
It is not true that one picture is worth a thousand words. It takes only a few words if they are the right words-to ignite the imagination and produce picture far more colorful than anything within the range of electronic communication.
Yet the ultimately importance and power of print is represented not by its superior images but by its ability to convey abstract ideas. No matter how intensive or prolonged a person's formal schooling may be, he is only partially educated if he is unable to think abstractly. He knows that the most vital ingredient in the making of decisions is sequential thought; This
A. It can help to produce excellent visual images.
B. It can help to eliminate illiteracy.
C. It can convey abstract ideas quickly and accurately.
D. It can help people communicate with each other.

[单项选择]I regret to say that your thesis requires more thinking than ______ for the problem is exceedingly complex.
A. to be put in
B. has been put in
C. being put in
D. have been put in