题目内容
B. least
C. less
In Chicago, a computerized system has been developed that controls(管理)traffic on the city’s 235 miles of seven expressways. Now one—a controller—can follow the movement of Chicago’s traffic by looking at a set of lights. The system uses electric sensors(感应器) that are built into each expressway, every half a mile. Several times a second, the computer receives information from each sensor and translates it into green, yellow or red lights on a map in the control room. 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?”the controller asked a visitor.“That’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 show immediately where an accident or a stopped car is blocking the tr
affic, 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 expressway for each one hundred million miles traveled, while in other parts of the county there are 2.6.
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,”said New York City’s traffic director and he added,“Chicago’s a good example.”
根据短文内容，选择最佳答案，并在答题卡上按要求作答。
【小题1】The passage is mainly about ________ on expressways in Chicago.
| A．the traffic control system | B．the movement of the traffic |
| C．the electric sensors | D．the traffic lights |
| A．the red light appears | B．the red light turns yellow |
| C．the yellow light appears | D．the green light turns red |
| A．some visitors are traveling on the expressway |
| B．there is no heavy traffic on Chicago’s expressways |
| C．the traffic on Chicago’s expressways is well managed |
| D．the number of accidents in the US has dropped by 18% |
| A．the red light | B．the truck that needs repairing |
| C．the traffic | D．the truck that is fixing the road |
| A．giving reasons and results | B．giving examples and explaining them |
| C．describing what he thinks | D．asking and answering questions |
Some day little cars may take the place of (代替) today’s cars. They are good for our earth. If everyone 26 such a little car in the future, there will be 27 pollution in the air. There will be more parking places in the cities, and the street will be 28 crowded(拥挤). Now the space for one car of the usual size can hole more than one such little car. Driving will be 29 , because these little cars can go only 50 kilometers one 30 . The future cars will be fine for going around the city, but they will not be 31 for going far away. The little car needs only two batteries(电池), 32 battery for the motor, and the other for the horn(喇叭) and the lights. If we still 33 the big cars along with the small ones; we will need to 34 two kinds of roads. Some roads will be used for the big fast cars, 35 other roads will be needed for the smaller and slower ones.
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