问题
单项选择题
Cumulonimbus clouds are formed by（）.
A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air
答案
参考答案：A
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Cumulonimbus clouds are formed by（）.
A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air
参考答案：A