根据对话内容，在每小题的空白处填入适当的句子，使对话意思完整。

A: Summer holiday is coming.  1     ?

B: Yes, I'm going to my hometown.

A:   2  ?

B: For about a month.  3   ?

A: I want to travel to Hainan Island. It's a beautiful place of interest.

B:   4  .But I have to visit my grandparents in my hometown.

A: It doesn't matter, If you stay in your hometown for fewer days, you'll have enough time to go traveling.

B:   5  .Then I will go to my hometown as soon as the holiday begins.

A: OK! I will wait for you until you come back.

B: That's a deal! Thank you.

一位销售人员在介绍产品时说：“我们厂出品的账册比其他厂的产品便宜三成”。这属于（）。

A.服务接近法

B.介绍接近法

C.社交接近法

D.利益接近法