What are researchers interested in doing as the road accidents worldwide increase to a shocking rate ? What is tree of robotic

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问题 What are researchers interested in doing as the road accidents worldwide increase to a shocking rate ?
What is tree of robotic drivers?

选项 A、It will take some time before robotic drivers can be put to practical use.
B、Robotic drivers are not allowed to drive on busy roads.
C、Robotic drivers can never replace human drivers.
D、Robotic drivers are too expensive to use.

答案A

解析文章最后、段说，为机器人司机编制程序后，它们就能使交通变得通畅，也许今后某一天，大家都拥有机器人司机，但是，这一天的到来还有待时日。B、C、D的内容在文中均没有提到；A句说，要实际使用机器人司机还需时日，这显然与末段最后一句表达的意思相吻合。

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