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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单项选择题
Jane and Tom have been able to reconcile their difference and are a happy family again.
A．settle
B．arrange
C．balance
D．pacify
单项选择题
Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.
A．insane
B．infectious
C．foreign
D．poisonous
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