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, who has the greatest degree of control in an administered system
A．Individual
B．Small businesses
C．Major corporations
D．The government
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-shaped.
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