单项选择题

If you play with electricity, you may get an electric ______.

A．strike
B．beat
C．shock
D．knock

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单项选择题

Researchers at the University of Illinois determined that the ______ of a father can help improve a child's grades.

A．involvement
B．communication
C．interaction
D．association

单项选择题

At the meeting both sides exchanged their views on a wide ______ of topics they were interested in.

A．extent
B．number
C．collection
D．range

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