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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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.
单项选择题
According to the passage, who has the greatest degree of control in an administered system
A．Individual
B．Small businesses
C．Major corporations
D．The government
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