单项选择题

In addition to bettering group and individual performance, cooperation ______ the quality of interpersonal relationship.

A．ascends
B．compels
C．enhances
D．prefers
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单项选择题
Some polls show that roughly two-thirds of the general public believe that elderly Americans are ______ by social isolation and loneliness.
A．reproached
B．favored
C．plagued
D．reprehended
单项选择题
The nuclear family ______ a self-contained, self-satisfying unit composed of father, mother and children.
A．refers to
B．defines
C．describes
D．devotes to
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