Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.<br>A:clearing weather<br>B:that a warm front has passed<br>C:probable thunderstorm activity<br>D:an approaching hurricane or typhoon

Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
A:clearing weather
B:that a warm front has passed
C:probable thunderstorm activity
D:an approaching hurricane or typhoon

出自：海船船员证

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