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Mary: Hey, John! Can you go to the post office with me?
John: Hey, Mary! Of course I can.
Mary: I want to buy a postcard.
John: To buy a postcard?
Mary: I want to send it to my pen pal. She is very friendly.
John: You are very polite to do so.
Mary: Oh, no. We got to know each other last month.
John: Oh, I see.
Mary: Let’s go by bus.
| A．How can we go there? |
| B．But what do you want to buy? |
| C．Who will you send it to? |
| D．It’s much faster than by bike. |
| E．Did you send anything to her last year? |
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
