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
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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
单项选择题
Jim knows little of mathematics, ______ of chemistry.
A．and still less
B．as well as
C．no less than
D．and still more
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