17.

　　M: Can I borrow your math textbook? I lost mine onthe bus.

　　W: You've asked the right person. I happen to havean extra copy.

　　Q: What does the woman mean?

　　正确答案：B

　　解析：本题关键在于听懂习惯表达“你问对人了(You'veasked the right person)。”男士向女士借数学课本，女士说“你问对人了。我碰巧有一本多余的。”说明她可以帮助男士。A是对You've asked the right person的曲解。

　　18.

　　W: Hello, this is Dr. Gray's office. We're calling to remind you of your 4:15 appointment foryour annual check-up tomorrow.

　　M: Oh, thanks. It's a good thing you've called. I thought it was 4:15 today.

　　Q: What do we learn from the conversation?

　　正确答案：A

　　解析：本题关键在于抓住时间的对比和口语表达“It's a good thing you've called. I thought... 幸亏你打来电话，我还以为……”体检预约在第二天，但男士以为是当天，故答案为A(他差点弄错了预约的日期)。