【单选题】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. (23)
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?