单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A. With a knife.
B. On the edge of some metal.
C. By some glass.
D. By a piece of paper.

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问答题

It is said that in New York City and elsewhere, the U. S. Department of Transportation is investigating ______.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。