【正确答案】 B

【答案解析】[听力原文]
W: Hey, Mike. I was just told that our sales seminar has been postponed by a week. The speaker was suddenly called away on an urgent business trip.
M: Really? That"s a shame. I"m just worried because I was hoping to learn some selling techniques before I leave for that trade show in Denver.
W: Well, the materials he left behind are very extensive. You might want to study them on your own.
M: I suppose I could. Besides, there are a number of Web sites on the topic, too.

[解析] 细节题 原因
本题是询问研讨会延期的原因，注意听与题目的核心词seminar delayed有关的内容。女士说“...our sales seminar has been postponed...The speaker was...called away on...business trip.”，即销售研讨会延期是因为发言者被派去出差了，故正确答案是B. A speaker had to leave for a trip.。

【正确答案】 A

【答案解析】[解析] 细节题 问题点
本题是问男士所担忧的问题，注意听男士话语中紧接在否定表达之后的内容。男士说“I"m just worried because I was hoping to learn some selling techniques before I leave for that trade show...”，即他现在比较担心，因为本来希望在参加贸易博览会之前能学习一些销售技巧，故正确答案是A. He will not learn sales techniques.。

【正确答案】 C

【答案解析】[解析] 细节题 建议
本题是询问女士向男士提了什么建议，注意听女士话语中与建议相关的表达。女士说“...the materials he left behind are very extensive. You might want to study them on your own.”，即发言者留下很多有价值的资料，建议男士进行自学，故正确答案是C. Study on his own。