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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单项选择题
In a barter economy, finding somebody who wanted to trade his old car ______ a sailboat might not always be an easy task.
A．in terms of
B．by auction for
C．by way of
D．in exchange for
单项选择题
The meeting was over ______ by the mayor to discuss the toll of crossing the bridges in Wuhan.
A．propelled
B．presumed
C．presided
D．pricked
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