17.
M: Er... Hi! Could you tell me where electronic products are displayed? I want to see some TVs, digital video cameras, DVD players-that sort of thing.
W: Well, several countries are displaying electronic products. China's selection is very large this year. You might as well go to the East wing first to take a look at the Chinese booth.
Q: Where is this conversation most probably taking place?
正确答案：C
解析：根据several countries和display可以得出发生地点应在international trade fair（国际贸易展览会）。

18.
M: Well, what did you think of the movie?
W: I don't know why I let you talk me into going. I just don't like violence! Next time you'd better choose a comedy.
Q: What can we infer from the conversation?
正确答案：D
解析：根据女士所说“我不知道为什么听你的话去看那部电影”，可以得出结论她不喜欢看那部电影，所以选D“后悔去看了”。