单项选择题

You have to make sure that you have chosen a secure solution.

A. clear
B. secret
C. advisable
D. safe
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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
They are endeavoring to change society as a whole.()

A. trying
B. working
C. doing
D. making
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