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

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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

單項(xiàng)選擇題

（）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