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A: Welcome!
B: Yes. I’d like to buy a pen for my good friend.
A: This way, please.
B: Let me go and see. That white one is nice.
A: It’s sixty-nine yuan.
B: Wow!
A:
B: Wonderful. I’ll take it.
A: OK! Here you are.
B: Thank you.
| A．How much is it? |
| B．Can I help you? |
| C．That’s too expensive! |
| D．The blue one is much cheaper. |
| E．There are many pens over there. |
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
