单项选择题

The tide is（）.

A.black
B.setting
C.being
D.having

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单项选择题
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.

A.falls／in
B.has been falling／on
C.has fallen／at
D.is falling／in
单项选择题
The term flood current refers to that time when the water（）.

A.is flowing towards the land
B.is moving towards the ocean
C.level is not changing
D.level is rising because of heavy rains
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