单项选择题

The doldrums are characterized by（）.

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

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单项选择题

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

单项选择题

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

单项选择题

Monsoons are characterized by（）.

A.light，variable winds with little or no humidity
B.strong，gusty winds that blow from the same general direction all year
C.steady winds that reverse direction semiannually
D.strong，cyclonic winds that change direction to conform to the passage of an extreme low pressure system