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

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单项选择题

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

单项选择题

A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.

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