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Traffic safety is everybody's business. So when you cross the road, you must look first, then cross the road. When the light is red, you must stop. And when the light is green, you can go. Sometimes the traffic rules are different in different countries. In China, you must walk or drive on the right. But in England, you must walk or drive on the left.
1．When you cross the road, you must look first. （2．When the traffic light is red, you can't go. （
3．You can cross the road when the traffic light is green. （
4．In China, you must walk on the left. （
5．You must drive on the fight in England. （
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
