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
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单项选择题
How are tornadoes distinguished from whirlwinds
A．Whirlwinds rotate in a different direction than tornadoes do.
B．Tornadoes travel over land and whirlwinds over water.
C．Tornadoes are larger than whirlwinds.
D．Only tornadoes are funnel-shape
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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