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  3. To know what is exactly happening on the roads, we don’t need to The use of mobile-phone signals in monitoring traffic is

To know what is exactly happening on the roads, we don’t need to The use of mobile-phone signals in monitoring traffic is

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问题 To know what is exactly happening on the roads, we don’t need to
The use of mobile-phone signals in monitoring traffic is
选项 A、monopolized by ITIS, a British company.
B、promising but still under experiment.
C、based on the data from people on roads.
D、effective in reducing traffic speeds.
答案B
解析 推理判断题。根据题干中的mobile-phone signals in monitoring traffic定位至第三段首句。该句指出：同时一家英国公司ITIS正在进行实验，用手机信号监测没有安装感应器和摄像头的道路的交通状况。结合该段末句中的this idea has great potential可以推断出答案。由该段首句中的 one of several firms可知ITIS不是唯一一家做这项实验的公司；末句指出：数据中必须排除掉行人和骑车的人。这与people on roads不一致；该段第二句提到deduce traffic speeds(推测通行速度)，reduce是对deduce的曲解。
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