单项选择题

Haze is not caused by（）.

A.forest fires
B.smoke from industrial areas
C.dust or sand storms
D.water droplets with the relative humidity more than 95%

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单项选择题

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

单项选择题

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

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