单项选择题

The survey showed that （）numbers of 15-year-olds were already smoking twenty cigarettes a week.

A. essential
B. steady
C. primary
D. substantial

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单项选择题
It is not too late, but （）action is needed.

A. fight
B. urgent
C. hurry
D. prompt
单项选择题
An enlarged prostate may （）the bladder and pinch off the urethra, causing pain and difficulty with urination.

A. collaborate
B. compress
C. bother
D. boil
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