单项选择题
Fetch is the().
A.Distance a wave travels between formation and decay
B.Stretch of water over which a wave-forming wind blows
C.Time in seconds required for two crests to pass a given point
D.Measurement of a wave's steepness
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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 -
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
