单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．The person who is addicted to the Internet.
B．The person who reads every label of the goods.
C．The person who wants to buy fruit.
D．The person who is not picky.
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填空题
By saying the woman said she found my face a challenge (Line 2, Para 1), the author suggests that her face is ______.
单项选择题
A．The quicker it vibrates, the greater the frequency of sound it produces.B．The slower it vibrates, the higher the frequency of sound it produces.C．The quicker it vibrates, the lower the frequency of sound it produces.D．The frequency of sound it produces is not in proportion to the speed it vibrates.
A．The quicker it vibrates, the greater the frequency of sound it produces.
B．The slower it vibrates, the higher the frequency of sound it produces.
C．The quicker it vibrates, the lower the frequency of sound it produces.
D．The frequency of sound it produces is not in proportion to the speed it vibrates.
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