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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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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In die 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．authentic
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