单项选择题

A series of brief showers accompanied by strong，shifting winds may occur along or some distance ahead of a(n)（）.

A.upper front aloft
B.cyclone
C.occluded front
D.cold front

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单项选择题

A.that blows towards the sea at night
B.that blows towards an island during the day
C.caused by cold air descending a coastal incline
D.caused by the distant approach of a hurricane

单项选择题

A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.

A.occluded front
B.warm front
C.cold front
D.warm sector

单项选择题

A hygrometer is a device used for determining（）.

A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity