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
This type of chair, easily ______ or folded away, is ideal for use in the garden.
A．put out
B．put in
C．put up
D．put forth
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单项选择题
In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.
A．sequentially
B．repeatedly
C．naturally
D．intentionally
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