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

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单项选择题

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

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

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