单项选择题

The author refers to straw embeded in fence posts in order to show

A．where tornadoes occur.
B．who makes reports about tornadoes.
C．when tornadoes take form.
D．how tornadoes affect physical objects.
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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
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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