From the first paragraph, we learn that the Internet______. Which of the following is not a problem brought in by the populariz

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问题 From the first paragraph, we learn that the Internet______.
Which of the following is not a problem brought in by the popularization of the Internet?

选项 A、Difficulty in inspecting the content of publications.
B、Difficulty in protecting copyright across national borders.
C、Difficulty in promoting sales of superior products.
D、The possibility that potentially harmful content may be published.

答案C

解析
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