单项选择题

Too much () to X-rays can cause skin burns, cancer or other damage to the body.

A. disclosure
B. exhibition
C. contact
D. exposure

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单项选择题
The heavily-populated area was a breeding place for () diseases.

A.infectious
B.powerful
C.influential
D.suspicious
单项选择题
The indoor swimming pool seems to be a great deal more luxurious than ().

A. is necessary
B. being necessary
C. to be necessary
D. it is necessary
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