单项选择题

I could hear nothing but the roar of the airplane engines which （）all other sounds.

A．overturned
B．drowned
C．deafened
D．smoothed

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单项选择题
At that time, the economy was still undergoing a （）and job offers were hard to get.

A．concession
B．supervision
C．recession
D．deviation
单项选择题
Cancer is a group of diseases in which there is uncontrolled and disordered growth of （）cells.

A．irrelevant
B．inferior
C．controversial
D．abnormal
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