单项选择题

Global warming threatens the （）of the whole human race.

A.summit
B.superiority
C.survival
D.status

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单项选择题

I had hardly sat down（）he stepped in.

A.when
B.that
C.until
D.after

单项选择题

The twins look alike but they are different in （）.

A.nature
B.characteristic
C.character
D.appearance

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