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You must know the traffic 1． if you walk in a city. The traffic lights are the same in every city. There 2． always 3． lights. You can cross the street at the 4． light and you must stop and wait at the 5． light. The 6． light means “Slow down and stop”. If you drive a car, you must drive on the 7． side of the road in China. But in England, people drive on the 8． side of the road.
| A．are | B．three | C．rules | D．left | E．right | F．green | G．red | H．yellow |
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
