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
My wife would rather we ______ each other any more.
A．do not see
B．did not see
C．will not see
D．had not seen
单项选择题
The most important environmental influence on fish is water temperature, for fish tend to ______ the temperature of their surroundings.
A．avoid
B．exceed
C．assume
D．regulate
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