A sign of thunderstorm development is a cumulus cloud（）.<br>A:darkening，growing in size and forming an anvil top<br>B:that shows extensive vertical development<br>C:creating cold downdrafts that are felt on the ground<br>D:All of the above

A sign of thunderstorm development is a cumulus cloud（）.
A:darkening，growing in size and forming an anvil top
B:that shows extensive vertical development
C:creating cold downdrafts that are felt on the ground
D:All of the above

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