单项选择题

Currents are（）in rate and direction.

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

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单项选择题
Current refers to the（）.

A.vertical movement of the water
B.horizontal movement of the water
C.density changes in the water
D.None of the above
单项选择题
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.

A.dike
B.revetment
C.cutoff
D.crib
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