单项选择题
A.forest fires B.smoke from industrial areas C.dust or sand storms D.water droplets with the relative humidity more than 95%
Good weather is usually associated with a region of（）.A...
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
Fog forms when the air（）.A.Is 50% water saturatedB.Is 9...
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
Fetch is the（）.A.Distance a wave travels between format...
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
