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Policeman:
Sam:
Policeman: Cross the road and then turn left. The bookshop is next to the flower shop.
Sam: OK. Thank you very much.
Policeman: No, you can't. Look at the traffic lights and you must wait for the green light.
Sam: I see. The light is green now.
Policeman: Please don't run.
Sam: OK. Thank you so much.
Policeman: You' re welcome.
| A．It's unsafe. |
| B．Can I cross the road now? |
| C．I should run quickly. |
| D．Yes, there is. |
| E．How can I get 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
