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

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单项选择题

A generally circular low pressure area is called a(n)（）.

A.cyclone
B.anticyclone
C.cold front
D.occluded front

单项选择题

A frontal thunderstorm is caused by（）.

A.pronounced local heating
B.wind being pushed up a mountain
C.a warm air mass rising over a cold air mass
D.an increased lapse rate caused by advection of warm surface air

单项选择题

A cyclone in its final stage of development is called a(n)（）.

A.tornado
B.anticyclone
C.occluded cyclone or occluded front
D.polar cyclone