17.第三节 补全对话 根据上下文的意思,把下列对话补充完整. A:(75)Can I help you? B:Yes,please.I want a sweater for my daughter. A:Look!Here are some sweaters for girls. (76)What size do you need? B:Size M. A:Do you like this red one? B:Yes.My daughter likes red best. (77)How much is it? A:25. B(78)It is too expensive.Do you have any cheaper ones?A:How about this one?It's only 18. B:Ok,I'll take it.Here's the money.(79)Thank you. A:You're welcome.