单项选择题

Alex Haley was ______ unheard of until he wrote the novel Roots.

A．truly
B．roughly
C．genuinely
D．practically
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单项选择题
The automan checked the car engine ______ but could find nothing wrong With it.
A．entirely
B．throughout
C．thoroughly
D．wholely
单项选择题
The industrial community should be close enough to the crowded centers but distant enough to reduce ______ hazards.
A．feasible
B．positive
C．potential
D．substantial
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