单项选择题

The firm ______ in producing cheap transistor radios.

A．exerts
B．excels
C．energizes
D．exploits
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单项选择题
People who refuse to ______ with the law will be punished.
A．obey
B．conceal
C．consent
D．comply
单项选择题
The team will have to do well to win a medal at the Olympic Games, where they will face ______ competition from several countries.
A．harsh
B．rigid
C．rough
D．stiff
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