单选题Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.Aclearing weatherBthat a warm front has passedCprobable thunderstorm activityDan approaching hurricane or typhoon
单选题
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
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