搜索
Every year there are many accidents (事故) on the road. They are mainly because of the children and the old people. Some of the people even die(死亡) in accidents. Children have accidents because they are not very careful. They sometimes play on the road and forget to look and listen before they cross the road. Old people can not see or hear very well. It is not safe for them to cross the road alone(单独的). To cross the road safely, we should look for a zebra crossing(斑马线). We must see left and right to make sure (确保) there are no cars on the road. We can cross the road only when the green light is on. The right way to cross the road is to walk quickly. It’s dangerous to run.
1．Many children and old people have accidents when they cross the road.2．Old people can not see or hear very well on the road.
3．We can cross the road when the red light is on.
4．It is safe for old people to cross the road alone.
5．It’s dangerous to run across the road.
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
