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.
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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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