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
Psychologists have errantly mounted an offensive against what they describe as nastiness toward students by educators.
A．arbitrariness
B．unpleasantness
C．severity
D．aloofness
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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