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
Hearing problems may be alleviated by changes in diet and exercise habits.
A. removed
B. cured
C. worsened
D. relieved
单项选择题
Many scientists have been probing psychological problems.
A. solving
B. exploring
C. settling
D. handling
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