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, 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
单项选择题
The author refers to straw embeded in fence posts in order to show ______.
A．where tornadoes occur
B．who makes reports about tornadoes
C．when tornadoes take form
D．how tornadoes affect physical objects
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