单项选择题

And the cars are tested for defects before leaving the factory

A．functions
B．motions
C．faults
D．parts
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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．settling
C．exploring
D．handling
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