单项选择题

Giving the child problems he cannot solve will only frustrate him.

A．baffle
B．worry
C．alarm
D．cultivate
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单项选择题
Perhaps more than anything else, it was onerous taxes that led to the Peasants' Revolt in England in 1381.
A．multiple
B．unjust
C．burdensome
D．infamous
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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