单项选择题
A.cyclone B.anticyclone C.cold front D.occluded front
A frontal thunderstorm is caused by（）.A.pronounced loca...
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
A cyclone in its final stage of development is called a...
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
A cloud sequence of cirrus，cirrostratus，and altostratus...
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
