单项选择题

The circulation around a low pressure center in the Northern Hemisphere is（）.

A.counterclockwise
B.variable
C.clockwise
D.anticyclonic

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How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）

A.within two hours
B.within three hours
C.within four hours
D.within five hours
单项选择题
It is dangerous for vessels without the operational radar（）the estuary.

A.to get
B.to approach
C.to proceed
D.to close
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