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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单项选择题
It is a （）ride from his home to the shopping center.

A. ninety-miles
B. ninety-mile's
C. ninety miles
D. ninety-mile
单项选择题
Don't forget to post the letter for me,（）

A. do you
B. will you
C. are you
D. can you
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