单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.
What does Professor Smith’s assistant do.

A．Teach an introductory economics course.
B．Make up homework problems.
C．Do research in the library.
D．Grade homework sets.

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单项选择题

单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. What does Professor Smith’s assistant do. 您的浏览器不支持 audio 元素。