單項選擇題

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

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單項選擇題

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

單項選擇題

The steady current circling the globe at about 60°S is the（）.

A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current