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單項(xiàng)選擇題

The currents are（）mosoonal origin．

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

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單項(xiàng)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

單項(xiàng)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