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
Adverse reviews in the New York press may greatly Change the prospects of a new Broadway production.
A．additional
B．encouraging
C．unfavorable
D．subversive
单项选择题
Many politicians find that they can no longer afford the luxury of a personal chauffeur.
A．valet
B．driver
C．secretary
D．servant
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