單項(xiàng)選擇題The edge of a hurricane has overtaken your vessel in the Gulf of Mexico,and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the().

A.navigable semicircle
B.dangerous semicircle
C.low pressure area
D.eye of the storm


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1.單項(xiàng)選擇題The drift and set of tidal,river,and ocean currents refer to the().

A.position and area of the current
B.speed and direction toward which the current flows
C.type and characteristic of the current's flow
D.None of the above

2.單項(xiàng)選擇題The direction of the surface wind is().

A.directly from high pressure toward low pressure
B.directly from low pressure toward high pressure
C.from high pressure toward low pressure deflected by the earth's rotation
D.from low pressure toward high pressure deflected by the earth's rotation

3.單項(xiàng)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

4.單項(xiàng)選擇題The currents are()mosoonal origin.

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

5.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