单项选择题

When the engine would not start, the mechanic inspected all the parts to find what was at______.

A. wrong
B. trouble
C. fault
D. difficulty
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单项选择题
Simon’s letter was in such a casual scrawl, and in such pale ink, that it was （）

A. vague
B. ambiguous
C. illegible
D. obscure
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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