17.
W: Open wide. Now show me where it hurts.
M: Here on the bottom, especially when I bite something cold or hot. I couldn't enjoy ice-cream and hot soup any more. It's a real torture.
Q: What is the most probable relationship between the two speakers?
正确答案：D
解析：关键是抓听到能表明双方身份的信息，“张大嘴，让我看看哪里痛”和“吃到凉的或是热的东西时”，可知D正确。

18.
M: Professor Smith certainly has a good reputation in the Department of English.
W: A well-deserved one. The same students who fall asleep in discussions and seminars fight for front-row seats in his lectures.
Q: What can we learn from the conversation?
正确答案：C
解析：well-deserved意为“名副其实”；另外关键是听懂女士话中的fight for front-row seats in his lectures“争抢前排的座位”，正确选项C中的well attended“出勤率很高”所表达的正是这个意思。