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
Trade relationships between the two countries will improve if their（）leaders could agree on the proposed quotas.

A. respectable
B. respective
C. respectful
D. respecting
单项选择题
Tom could hardly（）his excitement as he knew that he had made a real dis covery

A. conceal
B. reveal
C. show
D. discover
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