单项选择题

A.cold frontB.warm frontC.tropical frontD.occluded fron……

Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.

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

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单项选择题Brief，violent showers frequently accompanied by thunder and lightning are usually associated with（）.

A.passage of a warm front
B.passage of a cold front
C.winds shifting counterclockwise in the Northern Hemisphere
D.stationary high pressure systems

单项选择题As a cold front passes an observer，pressure（）.

A.drops and winds become variable
B.rises and winds become gusty
C.drops and winds become gusty
D.rises and winds become variable

单项选择题An occluded front is usually caused by a（）.

A.cold front becoming stationary
B.warm front becoming stationary
C.cold front overtaking a warm front
D.warm front dissipating

单项选择题An occluded front is caused by a(n)（）.

A.low pressure area
B.high pressure area
C.area of calm air
D.cold front overtaking a warm front

单项选择题An instrument designed to maintain a continuous record of atmospheric pressure is a(n)（）.

A.mercurial barometer
B.aneroid barometer
C.barograph
D.thermograph