单项选择题

Crisis would be the right term to describe the ______ in many animal species.

A. abolition
B. restriction
C. descent
D. decline
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Paper produced every year is four times ______ the weight of the world's production of vehicles.
A. /
B. that of
C. which
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The followings are all correct responses to Do you mind my smoking here EXCEPT
A. No, do it please.
B. No, of course not.
C. I'm sorry.
D. Yes, go ahea
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