单选题：According to the author, what is the key factor in the rise

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题目内容：

According to the author, what is the key factor in the rise of health cost in the U.S.? A．The refusal of insurance companies to pay the bills.
B．The increase of the number of doctors and hospitals.
C．The lack of government control over the medical prices.
D．The merger of private health care with the public system.

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回答(65)题

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