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
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单项选择题
In ancient times, some catastrophic extinction of species occurred ______.
A．sequentially
B．repeatedly
C．naturally
D．intentionally
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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