[解析]
ACB
W:Hello.May I speak to Mr.Smith?
M:This is David Smith speaking.Who's that?
W:This is Zheng Yun from Xingfu Middle School.I am calling to invite you to give our students a speech about English learning.Could you come?
M:When is it?
W:At 1 p.m.on January the second.Is it OK with you?
M:Yes.How long is the speech?
W:One and a half hours.
M:Could you send me your school address through emails?
W:No problem.