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单项选择题

According to the author, one of the driving forces behind M＆A wave is ______.

A．the greater customer demands
B．a surplus supply for the market
C．a growing productivity
D．the increase of the world's wealth

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单项选择题From paragraph 4 we can infer that ______.

A．the increasing concentration is certain to hurt consumers
B．WorldCom serves as a good example of both benefits and costs
C．the costs of the globalization process are enormous
D．the Standard Oil Trust might have threatened competition