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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. （
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
