单项选择题

Hearing problems may be alleviated by changes in diet and exercise habits

A．removed
B．cured
C．worsened
D．relieved
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单项选择题
Many scientists have been probing psychological problems
A．solving
B．settling
C．exploring
D．handling
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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