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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.
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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According to the passage, a barter economy can lead to ______.

A．rapid speed of transactions
B．misunderstandings
C．inflation
D．difficulties for the traders