单项选择题

We are using up our natural resources too quickly and at the same time we are（）our environment with dangerous chemicals.

A. protecting
B. saving
C. polluting
D. fighting

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（）man is （） reasoning animal.

A. The; a
B. / ;/
C. / ; a
D. The ; the
单项选择题
Hardly （） when they ran toward it.

A. had the plane landed
B. did the plane land
C. the plane had landed
D. the plane landed
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