问题
单项选择题
A．( What are the differences between marketing and cost-effective publicity
B．( Could you say something on the subject of cost-effective publicity
C．( How much will the conference on marketing and sales cost us
D．( When will the subject of the 50-minute conference be publicized
答案
参考答案：B
解析：[听力原文]The subject of the conference is marketing and sales. And I was wondering if you could give us a talk, say, fifty minutes or so, on cost-effective publicity.