单项选择题

John is collaborating with Mary in writing an article.

A．cooperating
B．competing
C．combining
D．arguing
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单项选择题
And the cars are tested for defectsbefore leaving the factory.
A．functions
B．faults
C．motions
D．parts
单项选择题
Hearing problems may be alleviatedby changes in diet and exercise habits.
A．removed
B．cured
C．worsened
D．relieved
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