单项选择题

______the Internet is shortening the distance between people, it may also be breaking homes or will cause other family problems.

A．When
B．While
C．If
D．As
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单项选择题
The______of a cultural phenomenon is usually a logical consequence of some physical aspect in the life style of the people.

A．implementation
B．demonstration
C．manifestation
D．exposition
单项选择题
The television networks believe that the period between 6 p. m. and 11 p. m. is the______television viewing time.
A．prime
B．primitive
C．primary
D．principal
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