单项选择题

· For questions 23-30, mark one letter A, B or C for the correct answer.
Which is right about Pay-Per-Click (PPC) advertisement

A. They are picture ads.
B. They are expensive.
C. They charge by customers’ click amount.

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· For questions 23-30, mark one letter A, B or C for the correct answer. Which is right about Pay-Per-Click (PPC) advertisement 您的浏览器不支持 audio 元素。