單項(xiàng)選擇題（）is an indication that the weather is about to clear.
A.Rising clouds
B.Lowering clouds
C.Thickening clouds
D.Scattering clouds
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1.單項(xiàng)選擇題（）is formed when the droplets or ice crystals in clouds have become sufficiently large to fall to the ground.
A.Humidity
B.Temperature
C.Precipitation
D.Wind
2.單項(xiàng)選擇題（）reters to be amount of water vapour in the air.
A.Humidity
B.Temperature
C.Precipitation
D.Wind
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Which of the following is not a form of precipitation?（）
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