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

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热门试题

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

单项选择题A cloud of marked vertical development (often anvil-shaped) would be classified as（）.

A.cirrus
B.cirrocumulus
C.altocumulus
D.cumulonimbus

单项选择题A boundary between two air masses is a(n)（）.

A.lapse rate
B.isobar
C.front
D.continent

单项选择题（）causing strong winds and rough sea north west Bay of Biscay.

A.Strong low pressure
B.Strong high pressure
C.Steep pressure gradient
D.Steep gradient pressure