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Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.

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Cumulonimbus clouds are formed by（）.

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

单项选择题A（）is created by a pressure gradient or slope in the water level.

A.gradient current
B.density current
C.swift current
D.torrent current

单项选择题（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.

A.FRONTAL FOG
B.MIXING FOG
C.ADVECTION FOG
D.RADIATION FOG

单项选择题（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.

A.MIXING FOG
B.ADVECTION FOG
C.RADIATION FOG
D.ARCTIC SEA SMOKE