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When we walk on the road in China, we must be careful. We must obey the traffic rules:
(1) Drive, ride or walk on the right side of the road.(2) When the light is red, we must stop.
(3) When the light is yellow, we must wait.
(4) When the light is green, we can cross.
1．We must obey the traffic rules when we walk on the road. （
2．I walk with my mum, so I needn't obey the traffic rules. （
3．We must walk on the left side of the road in China. （
4．When the light is yellow, we can cross. （
5．When the light is red, we can't cross. （
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
