单项选择题

It is extremely difficult or even impossible to work out the risk of occasional passive smoking.

A. calculate
B. exercise
C. eliminate
D. convert
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单项选择题
Smith and I studied under the same supervisor, worked together, and forged a lifelong friendship.
A. assessed
B. pledged
C. produced
D. dispersed
单项选择题
A. The girl used to be his best friend. B. He has never heard that name before. C. That name sounds familiar. D. It reminds him of someone with that name.
A. The girl used to be his best friend.
B. He has never heard that name before.
C. That name sounds familiar.
D. It reminds him of someone with that name.
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