单项选择题

Cyclones that have warm sectors usually move（）.

A.westerly
B.parallel to the isobars in the warm sector
C.toward the nearest high pressure area
D.faster than the accompanying cold front

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单项选择题

A.clearing weather
B.that a warm front has passed
C.probable thunderstorm activity
D.an approaching hurricane or typhoon

单项选择题

A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air

单项选择题

A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black