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
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相关考题
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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
