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David：Nice to meet you，Mr Lin.
Mr Lin：Nice to meet you，David.
David：Can you tell me some traffic rules(交通规则)？
Mr Lin：We should watch the traffic lights.When the light is green， we can go.____1.____
David：OK！
Mr Lin：Don't play football in the road.____2.____They are very important for us.
David：____3.____
Mr Lin：____4.____
| A．When the light is red，we must stop. |
| B．You are welcome. |
| C．Thank you. |
| D．Remember the traffic rules. |
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
