单项选择题

Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.()

A. are caused by
B. explain
C. derive from
D. constitute

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As a law graduate, he ought to know that eyewitness() is notoriously unreliable, especially so when the witness is not an expert.

A. insight
B. remark
C. argument
D. testimony
单项选择题
He() the job because it involved too much traveling.

A. took up
B. applied for
C. turned down
D. switched to
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