Over-the-counter drugs are the medicines ______. How many kinds of over-the-counter drugs are sold in the United States?

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问题 Over-the-counter drugs are the medicines ______.
How many kinds of over-the-counter drugs are sold in the United States?

选项 A、2,000.
B、100,000.
C、170,000.
D、5,000,000,000.

答案B

解析见第四段第一句。

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