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The traffic lights are the same in every country. There are always three lights: red, yellow and green. Red means “stop”. Yellow means “wait”, and green means “go”. In China, drivers drive on the right side of the road. In the USA, drivers drive on the right side, too. In the UK and Australia, drivers drive on the left side of the road. If you go by car, by bike or on foot, you must know the traffic rules.
1．There are _______ lights in every country. ( )| A．two | B．three | C．four |
| A．Stop and wait | B．Slow down and stop | C．Go |
| A．left | B．middle | C．right |
| A．left | B．middle | C．right |
| A．look left | B．look right | C．go |
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
