单项选择题

When we were in the mountains, we often found ourselves entirely enveloped by the fog.

A．confined
B．surrounded
C．darkened
D．blocked
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单项选择题
Giving the child problems he cannot solve will only frustrate him.
A．baffle
B．worry
C．alarm
D．cultivate
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
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