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    精英家教网 > 初中英语 > 题目详情
    阅读理解。
          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 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 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."
    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
    2. When the cars move under 30 miles an hour, _________ on the map in the control room.
    A. the red light appears
    B. the red light turns yellow
    C. the yellow light appears
    D. the green light turns red
    3. According to the passage, we may learn _________.
    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%
    4. In Paragraph 2 the underlined word "it" refers to _________.
    A. the red light
    B. the truck that needs repairing
    C. the traffic
    D. the truck that is fixing the road
    5. The writer writes the article mainly by _________.
    A. giving reasons and results
    B. giving examples and explaining them
    C. describing what he thinks
    D. asking and answering questions
    1-5     AACDB
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