听下面一段对话，回答第14至第17题。
Why does David go to Professor Smith for help?
此题为简单的推断题。根据David说的 “I didn’t get to copy down all the terms you mentioned in today’s lecture” 以及Professor Smith的问句 “Do you remember what parts of the lecture you had trouble with?”可以得知David求助的是与today’s lecture相关的内容。所以正确选项是B。
What should David do at the start of each class?
此题为事实细节题。根据Professor Smith的话 “What I suggest is that you copy down the key points that I put on the board at the start of each class.” 可以得出“copy down the key points”是正确答案，A选项是其同义转述。
How can David find the most important information to write down?
此题为事实细节题。根据Professor Smith的话 “Focus on understanding the organization of the lecture. That will help you find the most important information you should write down.” 可以得知正确答案为C。
How many suggestions has Professor Smith given to David?
【听力原文】
M：Can I talk to you for a minute，Professor Smith?
W：Sure，David.What can I do for you?
M：I didn’t get a copy down all the terms you mentioned in today’s leeture，and I know they were important.
W：Do you remember what parts of the lecture you have trouble with?
M：Er，not really.
W：Mmm，can I take a look at your notes?
M：Sure.
W：Mmm，interesting.
M：What?
W：David，just by looking through your notes from today and from lastweek’s classes I Can tell that you’ve been missing a lot of the importantinformation for my lectures.Your notes are rather incomplete.
M：What’S wrong?I thought I took good notes.
W：Mmm，not exactly.I think your note—taking skill needs some improvement.
M：Oh.
W：What I suggest is that you copy down the key points that I put on the1 board at the start of each class.That way you Can follow along and keep up will the main ideas of the lecture.
M：OK.
W：Second，use the key points to help you fill in the details that developeach main point.Don’t worry about writing down everything I sayword for word.It looks you were trying to do that.Focus on understanding the organization of the lecture，that will help you fmd the most important information you should write down.
M：All right.Thanks，Professor Smith.
W：Oh，and one more ming，you might find it useful to shorten word than use special marks，that Can save you a lot of time.
【解析】
此题为略有难度的综合推断题。根据文中Professor Smith话语中所涉及的 “what I suggest is…”, “second” “and one more thing”, 可知Professor Smith共提出了3个建议。所以正确答案是B。