單項選擇題Good weather is usually associated with a region of().

A.low barometric pressure
B.high barometric pressure
C.falling barometric pressure
D.pumping barometric pressure


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1.單項選擇題Fog forms when the air().

A.Is 50% water saturated
B.Is 90% water saturated
C.Temperature is greater than the dew point temperature
D.Temperature is equal to,or below the dew point temperature

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題Cumulonimbus clouds are formed by().

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