单项选择题

Giving the child problems he cant solve will only frustrate him.

A．baffle
B．worry
C．alarm
D．cultivate
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单项选择题
The environmental balance among ecological communities is exceedingly complex.
A．almost
B．successfully
C．extremely
D．rarely
单项选择题
Psychologists have recently mounted an offensive against what they describe as nastiness toward students by educators.
A．arbitrariness
B．unpleasantness
C．severity
D．aloofness
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