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Mary: Hello, Lucy! 1． I want to post a letter.
Lucy: OK. Let's go. 2．
Mary: I'll post it to America.
Lucy: 3．
Mary: I think ten yuan or more.
Lucy: That's too dear. Why not send an e-mail on the computer?
Mary: That's a good idea.
Lucy: 4．
Mary: Yes, I can. Let's go and find a computer.
| A．How much is the postage? |
| B．Where do you post your letter? |
| C．Can you write an e-mail? |
| D．Let's go to the post office. |
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
