单项选择题

The researchers sought to determine if rest periods would reduce worker __________ and therefore contribute to increased output across the day.

A．damage
B．nightmare
C．fatigue
D．relief
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单项选择题
Differences emerge in three ways: argument, competition, and conflict--which alone is __________ wholly harmful.
A．admitted
B．acknowledged
C．absorbed
D．considered
单项选择题
The gross national product __________ one percent by the same time of last year.
A．condensed
B．slimmed
C．dissolved
D．shrank
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