单项选择题

Questions 17 ～ 20 are based on the following passage. You now have 20 seconds to read Questions 17 ～ 20.
According to the speaker, what kind of problems do phrase books have

A．They are actually useless.
B．They have a practical problem.
C．They should be designed in more phrases.
D．They don’t provide enough useful phrases.

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What’s the direct harm Internet will do to you

Questions 17 ～ 20 are based on the following passage. You now have 20 seconds to read Questions 17 ～ 20. According to the speaker, what kind of problems do phrase books have 您的浏览器不支持 audio 元素。