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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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
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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