题目内容
（请给出正确答案）
提问人：网友d*******1
发布时间：2022年4月5日 20:10
[单项选择题]
Text 3 Is sitting in traffic as inevitable as death and taxes Perhaps not. Many countries now hav...The use of mobile-phone signals in monitoring traffic is（）
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.
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（由十点题库聘请的专业题库老师提供的解答）
