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
The primary objective of Basic Econometrics is to provide an elementary but a comprehensive introduction to the art and science of econometrics.
A．brief
B．precise
C．simplified
D．extensive
单项选择题
The environmental balance among ecological communities is exceedingly complex.
A．almost
B．successfully
C．extremely
D．rarely
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