单项选择题

A.Pressure gradientB.Coriolis effectC.Aurora borealisD.……

The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.

A.Pressure gradient
B.Coriolis effect
C.Aurora borealis
D.Ballistic deflection

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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

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

单项选择题MIST is caused by（）.

A.forest fires
B.smoke from industrial areas
C.dust or sand storms
D.water droplets with the relative humidity more than 95%