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The ride-sharing company Uber has removed its self-driving cars from the streets of San Francisco,California. The action came after a dispute between Uber and state officials over whether the vehicles needed special permits to operate.

Uber recently launched testing of its self-driving service in San Francisco.But shortly after the launch, California's Department of Motor Vehicles (DMV) told the company to stop the self-driving vehicles.State officials said the Uber cars needed the same special permit given to about 20 other companies testing self-driving technology in California.Uber argued that its technology does not make vehicles fully autonomous,and so the special permit was not needed.It added that all of Uber's "self-driving" cars have a driver sitting in the passenger seat to take over if needed.

The head of Uber's self-driving technology,Anthony Levandowski,explained the company's position in a blog post.He said the self-driving Uber vehicles do use high-technology tools to assist drivers.But they are not fully autonomous and require a driver to be at the controls at all times..He compared the technology to solar carmaker Tesla's advanced driver assist tools.Telsa's Autopilot system allows its cars to steer in a lane,change lanes,and speed up or slow down based on nearby traffic.The company tells drivers that,when using Autopilot,they should still always be ready to take control of the vehicle.Vehicles equipped with these high-tech driver assist tools do not need a special permit to operate in California.

It's hard to understand why the DMV would seek to require self-driving Ubers to get permits when it accepts that Tesla's autopilot technology does not need them,"Levandowski wrote.San Francisco's mayor,Ed Lee,praised the DMV for stopping Uber's self-driving vehicles.He said he supports self-driving development and testing.But only under conditions that put human bicyclists' and pedestrian safety first."

1.What does the underlined word "dispute" in Paragraph 1 mean?

A. Discussion. B. Disagreement.

C. Fighting. D. Meeting.

2.Why does Uber say that the special permit was not needed?

A. Because Uber's "self driving" cars are fully autonomous.

B. Because there are passenger seats in Uber's "self-driving" cars.

C. Because no drivers are needed in some Uber's "self-driving" cars.

D. Because Uber's "self-driving" cars can be operated by humans when necessary.

3.What can we know from the passage?

A. Uber's self-driving cars need human drivers.

B. Telsa's Autopilot needs special permits too.

C. Uber's self-driving cars are completely autonomous.

D. Telsa's Autopilot system is better than Uber's self-driving technology.

4.What can we infer from Ed Lee's words?

A. He doesn't think DMV is right.

B. Uber's self-driving cars should he supported.

C. Uber's serf-driving cars are not safe enough.

D. One should be careful while walking or cycling in streets.

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