17. W: Jim, I'm having difficulty with all the theoretical stuff we are getting in our computer course.
M: Oh, that part I understand. What I can't figure out is how to make it work in my program.
Q: What is the man's problem?

解析：D。男士說他不知怎樣在程序中運用（理論），C中的"apply the theory to the program"正是男士所說內容的同義表達。所以答案為D。

18. M: I must point out that trials of new medicine are expensive, and you can never guarantee success.
W: But there is a very good chance in this case. I do hope you will go ahead in view of the potential benefit to mankind.
Q: What are the two speakers talking about?

解析：B。男士認為新藥的試驗費用很高，而女士則說：“我真的希望您考慮到它可能給人類帶來的好處而繼續研究下去。”可知他們在討論新藥。答案為B。