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
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相关考题
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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
