17.
Q: What does the man mean?
A. He needs another job as research assistant.
B. He asks for Professor William for assistance.
C. He assists Professor William with his teaching.
D. He is doing research with Professor William.
18.
Q: What do we know from the woman's reply?
A. She thought there were no tickets left for the show.
B. She thought the seats on the left side were occupied.
C. The show was planned a long time ago.
D. The audience were deeply impressed by the show.
录音原文：
17.
W: John, are you doing research for Professor William this semester?
M: Actually, I'm working as his teaching assistant.
18.
M: I heard there're a few seats left for the show tonight.
W: Really? I was under the impression that the tickets were sold out a long time ago.
解析：
17. C 关键是要听到actually后面的话“我整做他的助教呢。”teaching assistant的职责就是assist...with his teaching，C是男士原话的同义表达，故为答案。选项A,B,D均是用research和assist及其派生词来进行干扰。
18. A 关键是要听到really后面的话“我以为票早就被卖光了。” there were no tickets left就是tickets were sold out的同义表达，故选A。sell out 表示“卖完，卖光”。对话中的left是动词leave的过去分词，意思是“剩下”，而并非形容词“左边的”，选项B即是用left“左边的”一次来进行干扰;选项C利用了a long time ago进行干扰，而选项D利用impression的派生词进行干扰，但实际上它们的内容与对话无关。
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