單項選擇題In the doldrums you can expect（）.

A.steady, constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity


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1.單項選擇題In the doldrums you will not have（）.

A.high relative humidity
B.frequent showers and thunderstorms
C.steep pressure gradients
D.frequent calms

2.單項選擇題In the northern hemisphere, the largest waves or swells created by a typhoon or hurricane will be located（）.

A.in the southeast quadrant of the storm
B.directly behind the storm center
C.forward and to the right of its course
D.behind and to the left of its course

3.單項選擇題In weather report, position good means that（）.

A.the position is suitable
B.the position is reliable
C.the position is changeable
D.the position is fixable

4.單項選擇題In which voyage, between two points, is the rhumb line distance not approximately the same as the great circle distance?（）.

A.The two points are in low latitudes in the same hemisphere
B.The two points are in high latitudes in the same hemisphere
C.The two points are near the equator, but in different hemispheres
D.One point is near the equator, one point is in a high latitude, and both are near the 180th meridian