单项选择题

This passage is about a______.

A．law
B．hypothesis
C．guess
D．theory
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单项选择题
A study of thunderclouds over the North Atlantic showed that lightning occurred only when the air temperature______.
A．around the cloud was below freezing
B．around the cloud was above freezing
C．about the cloud was lower than the temperature below the cloud
D．of the cloud was above freezing
单项选择题
According to Dr. Scorer, lightning is caused by______.
A．rain falling through clouds
B．hail falling through supercooled clouds
C．hail falling through superheated clouds
D．ice particles falling through any clouds
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