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An air mass is termed warm if ______.
A.it is above 70°F
B.the ground over which it moves is cooler than the air
C.it originated in a high pressure area
D.it originated in a low pressure area
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stabilityB
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单选题A frontal thunderstorm is caused by（）.A
pronounced local heatingB
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单选题Clouds form（）.A
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单选题（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.A
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radiation fogC
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