单项选择题

I have been trying to quit smoking.

A. give up

B. pick up
C. build up

D. take up
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单项选择题
America's emphasis on the importance of education for everyone has spurred scientific research.（）

A. encouraged
B. endangered
C. endorsed
D. enlarged
单项选择题
She has proved that she can be relied on in a crisis.（）

A. lived on
B. depended on
C. lived off
D. believed in
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