单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A. To produce a gas containing carbon and hydrogen.
B. To remove impurities from methanol.
C. To heat the reactors.
D. To prevent dangerous gases from forming.

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单项选择题

A. The man has mistakenly received someone else’s books.B. The man changed his major from art to business.C. The man recently moved off campus.D. There are two students named Robert Smith.

A. The man has mistakenly received someone else’s books.
B. The man changed his major from art to business.
C. The man recently moved off campus.
D. There are two students named Robert Smith.

Questions 9 to 12 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 9 to 12 are based on the conversation you have just heard.