單項(xiàng)選擇題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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1.單項(xiàng)選擇題Cumulonimbus clouds are formed by().

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

2.單項(xiàng)選擇題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