单项选择题

Chimpanzees are frequently used as stand-ins for human beings in experiments.

A．partners
B．role-models
C．stand-bys
D．substitute
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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
单项选择题
The mother is told that her child is desperately ill—the chances of survival are slim, and the treatment is as dreadful as the disease.
A．incurable
B．fearful
C．impossible
D．troublesome
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