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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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American corporations areA. free from international competition.B. immune to industrial consolidation.C. under the intense pressure of international competition.D．stopping the pain 0f industrial consolidation．
American corporations areA. free from international competition.B. immune to industrial consolidation.C. under the intense pressure of international competition.D．stopping the pain 0f industrial consolidation．
单项选择题
What is the main purpose of the passage
A．To outline contrasting types of economic systems.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.
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