判断正误。
Mary: Hello, Lucy. What are you doing?
Lucy: I’m sending some postcards. What about you?
Mary: I am sending letter. Where are you sending your postcards?
Lucy: I am sending it to America and where are you sending your letter?
Mary: I am sending it to Canada.
Lucy: How much are the stamps?
Mary: I think they are ten yuan or more.
Lucy: That’s too expensive.
Mary: I think so.
Lucy: Why not send an email on a computer?
Mary: That’s a good idea.
1．Lucy and Mary are on the train. （_____）
2．Lucy is sending her postcards to America. （_____）
3．Mary is sending postcards, too. （_____）
4．The stamps are cheap. （_____）
5．Mary thinks email is not good. （_____）
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