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  3. What might driving on an automated highway be like? The answer depends on what kind of system is ultimately adopted. Two dis

What might driving on an automated highway be like? The answer depends on what kind of system is ultimately adopted. Two dis

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问题     What might driving on an automated highway be like? The answer
    depends on what kind of system is ultimately adopted. Two distinctive       【M1】______
    types are on the drawing board. The first is a special-purpose lane system,
    which certain lanes are reserved for automated vehicles. The second is a    【M2】______
    mixed traffic system; fully automated vehicles would share the road with
    particularly automated or manually driving cars. A special-purpose lane     【M3】______
    system would require more expensive physical modifications to existing
    highways, and it promises the greatest gains in freeway capacity.           【M4】______
    Under either schemes, the driver would specify the desired,                 【M5】______
    destination furnishing it to a computer in the car in the beginning of
    the trip. If a mixed traffic system was in the place, automated driving     【M6】______
    could begin whenever the driver was on suitably equipped roads.
    Whenever special-purpose lanes were available, the car could join           【M7】______
    existing traffic in two different ways. One method would use a special
    onramp. As the driver approached the point of entry for the highway,
    devices installed on the roadside would electronically check the vehicle to
    determine their destination and to ascertain that it had the proper         【M8】______
    automation equipment in good working order.
    Either approach would harmonize the movement of new entering                【M9】______
    vehicles with those already traveling, Automatic control here should
    allow smooth merging. And once a vehicle had settled into automated         【M10】______
    travel, the driver would be free to release the wheel, open the morning
    paper or just relax.
【M8】
选项
答案their→its
解析 代词单复数错误。根据上文的the vehicle和下文的it，只有将their改为its，才能与上文的the vehicle形成(单数)照应关系。
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