单项选择题

Why do tornadoes appear to be dark

A．They occur only at night.
B．They are funnel - shaped.
C．They pick up debris from the ground.
D．They are water - laden.
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单项选择题
According to the passage, which of the following behaviors is frequently characteristic of funnel clouds
A．Descending from different cloud bases.
B．Occurring in isolated areas.
C．Lasting a long time.
D．Occurring in groups.
单项选择题
According to the passage, some tornadoes take people unaware because they
A．produce a sound similar to thunder.
B．cannot be seen until it is too late.
C．look so much like other clouds.
D．carry so many large pieces of debris.
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