单项选择题

The office staff ______ gathered to hear the president speak.

A．are
B．is
C．has
D．will have
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单项选择题
Some people feel that television should give less ______ to sport.
A．programs
B．coverage
C．concern
D．involvement
单项选择题
Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are ______ off.
A．avoided
B．excluded
C．screened
D．separated
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