问题
单项选择题
（）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
答案
参考答案：C
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（）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
参考答案：C