單項(xiàng)選擇題

The two most effective generating forces of surface ocean currents are（）.

A.temperature and salinity differences in the water
B.wind and density differences in the water
C.water depth and underwater topography
D.rotation of the Earth and continental interference

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單項(xiàng)選擇題

The tide is（）.

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

單項(xiàng)選擇題

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

The two most effective generating forces of surface ocean currents are（）.

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The tide is（）.

The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.

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