单项选择题

A．There is an office furniture show.
B．There is a painting exhibition.
C．There is a modern art contest.
D．There is an off- season sale.
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单项选择题
This passage is about a______.
A．law
B．hypothesis
C．guess
D．theory
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
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