We can learn from the beginning of the text that doctors in Philadelphia ______. By mentioning "double-dipping" (Paragraph 4),

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问题 We can learn from the beginning of the text that doctors in Philadelphia ______.
By mentioning "double-dipping" (Paragraph 4), the author is talking about ______.

选项 A、compensations.
B、premiums.
C、stock shares.
D、investment.

答案A

解析
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