單項選擇題The direction of the southeast trade winds is a result of the（）.

A.equatorial current
B.humidity
C.rotation of the earth
D.change of seasons


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1.單項選擇題The currents are（）mosoonal origin．

A.from
B.on
C.in
D.of

2.單項選擇題The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.

A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current

3.單項選擇題The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.

A.must be from dead ahead
B.speed must be zero
C.must be from dead astern
D.must be on the beam

4.單項選擇題The apparent wind can be zero when the true wind is from（）.

A.ahead and equal to the ship's speed
B.astern and equal to the ship's speed
C.ahead and equal to twice the ship's speed
D.astern and equal to twice the ship's speed

5.單項選擇題Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.

A.spring，around late evening
B.spring，around early evening
C.fall，around early morning
D.fall，around midday