听力原文：M: Math Department, Doctor Webster speaking.W: Hello, Prof. Webster. This is Jane

听力原文：M: Math Department, Doctor Webster speaking.

W: Hello, Prof. Webster. This is Janet Hill speaking. I live two doors down from your teaching assistant-Don Williams. Don asked me to call you because he has lost his voice and can't talk to you himself.

M: I'm sorry to hear that. Is there anything I can do for him？

W: He has a class this afternoon from 2:30 to 4:00 but he won't be able to give it, and he doesn't want to cancel it.

M: Does he want me to give the class？

W: No. He just wants someone to give back the mid-term exam papers. He's already marked them and they are on his office table.

M' His classes are at 2:30, right？ Well, I think I could do it for him. Which room is his class in？

W: Yes. Cater Hall, Room 224. Do you need his office key to get the papers？ He's given it to me and I could bring it to you.

M: Oh, that's not necessary. We have a master key in the Math Department.

W: Thank you, Prof. Webster. Oh, yes, I almost forgot.

M: Yes？

W: Could you put the next assignment on the board, too？ It's all the questions on page 45, and they are due at the next class.

M: OK. Thanks for passing on the news about Don, and please tell Don not to worry about anything.

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A．He can't find his car key.

B．He misplaced some exams.

C．He is unable to talk.

D．He doesn't like his classes.