题目内容
A green light means traffic is moving forty-five miles an hour, yellow means thirty to forty-five miles an hour, and red means heavy traffic-cars standing still or moving less than thirty miles an hour.“See that red light near Austin Avenue (大道)？”the controller asked a visitor. “There’s a repair truck fixing the road, and the traffic has to go around it.”
At the Roosevelt Road entrance to the expressway, the light kept changing from green to red and back to green again. “A lot of trucks get on the expressway there.” the controller explained. “They can’t speed up as fast as cars.”
The sensors(传感器) show immediately where an accident or a stopped car is blocking traffic, and a truck is sent by radio to clear the road. The system has lowered the number of accidents by 18 percent. There are now 1.4 deaths on Chicago’s expressways for each one hundred million miles traveled, while in other parts of the country there are2.6
Traffic experts say that the Chicago system is the “coming thing”. Systems like Chicago’s are already in use on some expressways in Los Angeles and Houston. “Chicago has taken the lead.” says New York City’s traffic director; and he adds, “we are far being…”
1.What would be the best title for this text?
A. Computerized Traffic Control System B. Rush Periods Getting Longer
C. The Nation’s Busiest Road D. Sensors on Expressways
2.How does the controller follow Chicago’s traffic?
A. By learning how to use a computer.
B. By waiting for the red light to turn to green.
C. By watching the sensors built into expressways.
D. By looking at a set of lights on the map in the control room.
3.The underlined word “it” in the passage refers to .
A. a truck which needs repairing B. a truck doing repairs on the road
C. Austin Avenue D. a red light
4.The system in Chicago .
A. is really effective B. is actually of very little use
C. will be sent to Los Angeles D. is looked down upon by New York’s traffic director
提示：
| 1. 阅读全文，通过红黄绿灯的频繁交替更换以控制车速、路障的迅速清除及车祸数量的降低，可得知这都是电脑化的交通控制系统的发挥作用。
2. 通过阅读第四段的头一句可知答案。 3. 前面提到有一辆卡车在修理，那么车辆必须要绕过卡车行驶 4. 最后一段可知，芝加哥已经开始使用这种系统，那么已经是效率很高的了
|
star of China.