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
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.
单项选择题
A．controlsB．overtakesC．predominatesD．overwhelms
A．controls
B．overtakes
C．predominates
D．overwhelms
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