单项选择题
The two psychologists had to
modify
the American Sign Language somewhat in order to accommodate the chimpanzees' spontaneous gestures.
A.change
B.abort
C.shorten
D.enhance
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单项选择题
In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space exploration.
A.probing
B.revenge
C.invasion
D.expansion
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单项选择题
A number of animals in Aesop' s fables are portrayed as being crafty.
A.vain
B.virtuous
C.artistic
D.cunning
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