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
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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