单项选择题

The engine is () at 6,000 revolutions per minute.

A. turning in
B. turning off
C. turning over
D. turning to

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单项选择题
Air, or () is called atmosphere, surrounds the whole earth.

A. it
B. that
C. which
D. what
单项选择题
What you do in your spare time is your own ______. However it should not be harmful to others.
A. business
B. purchase
C. bargain
D. sale
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