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B: I'm writing a postcard to my cousin.
A: Do you have a stamp?
B:
A: Really?
B：Look! It’s a Bing Dwen Dwen (冰墩墩).
A: Wow! It's cute. How much is the stamp?
B:
A: Oh. It's good. I want to buy one, too.
B: I bought it in the shop near our school.
A: Okay. Thanks.
| A．Yes, I do. |
| B．It's two yuan. |
| C．What is it? |
| D．Where did you buy it? |
| E．What are you doing now? |
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
