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阅读理解 San Francisco — After years of testing with a human backup driver, General Motor's Cruise is launching fully driverless cars onto public streets in San Francisco, the most complex urban environment robocars that have been tested, the company announced. The company said on Wednesday it was deploying (部署) five self-driving vehicles in San Francisco's Sunset District, an area that bears many of the city's typical traits: narrow and busy streets, steep inclines (坡度) and fog. Cruise said it was confident enough to launch the driverless trials after five years' testing. The company, which began the driverless testing in November, said it plans to expand to other neighborhoods. But the first tests will not put the driverless vehicle fully in control. Instead, the backup driver will be effectively moved to the passenger seat at early trials. Although those operations will not have access to traditional driver controls, they will be able to stop the vehicle if there is an emergency. Companies in Silicon Valley and elsewhere are working to make driverless vehicles a reality, saying that they will help decrease motor vehicle deaths, which number around 40,000 annually, and allow cheaper ride-hailing (打车) trips by ridding of the need to pay a human driver. Companies such as Cruise and competitor Zoox have set their sights on San Francisco, seeing the potential reward of conquering a complex urban environment and the country's second-most populated major city, rather than starting small and gradually making progress. （1） For what reason is San Francisco chosen for the testing place? A . Its high technology. B . Its developed economy.    C . Its crowded roads. D . Its complex surroundings. （2） Why the backup drive is placed in the driverless car in testing? A . To decide the route of the driving. B . To stop the car in urgent situations. C . To operate some major functions. D . To keep the passenger seat occupied. （3） What benefit will driverless vehicles bring? A . lower taxi fee. B . better urban environment. C . less traffic jam. D . greater company profit. （4） What's the best title for the text? A . Benefits Brought by Driverless Cars B . Driverless Cars Almost Close to Reality C . Cruise Launching Driverless Cars in San Francisco D . San Francisco: Perfect Testing Place for Driverless Cars 答案： D B A C

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