单选题A frontal thunderstorm is caused by（）.Apronounced local heatingBwind being pushed up a mountainCa warm air mass rising over a cold air massDan increased lapse rate caused by advection of warm surface air
单选题
A frontal thunderstorm is caused by（）.
A
pronounced local heating
B
wind being pushed up a mountain
C
a warm air mass rising over a cold air mass
D
an increased lapse rate caused by advection of warm surface air
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