单项选择题

Charted depths are decreased（）2 meters.

A.in
B.on
C.with
D.by

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单项选择题

Chief, I see that ship（）to her port.

A.turns
B.turning
C.to turn
D.be turning

单项选择题

Currents are（）in rate and direction.

A.vary
B.variable
C.variably
D.variability

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