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
How are tornadoes distinguished from whirlwinds
A．Whirlwinds rotate in a different direction than tornadoes do.
B．Tonadoes travel over land and whirlwinds over water.
C．Tonadoes are larger than whirlwinds.
D．Only tornadoes are funnel-shape
单项选择题
In the second paragraph, the word real in real goods could best be replaced by which of the following
A．high quality.
B．concrete.
C．utter.
D．authenti
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