單項(xiàng)選擇題

The doldrums are characterized by（）.

A.Steady，light to moderate winds
B.Frequent calms
C.Clear skies
D.Low humidity

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單項(xiàng)選擇題

The direction of prevailing winds in the Northern hemisphere is caused by the（）.

A.Magnetic field at the North Pole
B.Gulf Stream
C.Earth's rotation
D.Arctic cold fronts

單項(xiàng)選擇題

Steady precipitation is typical of（）．

A.Coming cold weather conditions
B.A warm front weather condition
C.High pressure conditions
D.Scattered cumulus cloudsduring the day