47. According to the author, attention should be paid to how driverless cars can __________.
- A. help deal with transportation-related problems
- B. provide better services to customers
- C. cause damage to our environment
- D. make some people lose jobs
答案：A
答案句：While much of the debate so far has been focused on the safety of driverless cars(and rightfully so), policymakers also should be talking about how self-driving vehicles can help reduce traffic jams, cut emissions(排放) and offer more convenient, affordable mobility options.
参考译文：尽管迄今为止的许多争论都集中在无人驾驶汽车的安全性上（这理所当然），但政策制定者还应该讨论自动驾驶汽车如何帮助减少交通堵塞、减少排放并提供更方便、更实惠的出行选择。
定位线索：题干“attention should be paid”→答案句“policymakers also should be talking about”；文中“reduce traffic jams, cut emissions and offer more convenient, affordable mobility options”对应选项A“help deal with transportation-related problems”。
解析：题干问作者认为应关注无人驾驶汽车如何做，答案句明确指出政策制定者应讨论其如何减少交通堵塞、减少排放、提供便利出行，这些都属于交通相关问题，与A项“help deal with transportation-related problems”同义转述。B项“provide better services”在文中未提及，属于无中生有；C项“cause damage to our environment”与原文“cut emissions”相反，偷换概念；D项“make some people lose jobs”文中未提及。
48. As for driverless cars, what is the author’s major concern?
- A. Safety.
- B. Side effects.
- C. Affordability.
- D. Management.
答案：D
答案句：Policymakers should start thinking now about how to make sure the appearance of driverless vehicles doesn’t extend the worst aspects of the car-controlled transportation system we have today. The coming technological advancement presents a chance for cities and states to develop transportation systems designed to move more people, and more affordably.
参考译文：政策制定者现在就应该开始思考如何确保无人驾驶汽车的出现不会延续我们今天以汽车为主导的交通系统的最糟糕方面。即将到来的技术进步为城市和州提供了发展交通系统的机会，这些系统旨在更经济地运送更多人。
定位线索：题干“major concern”→答案句“Policymakers should start thinking now about how to make sure...”；文中“doesn’t extend the worst aspects”对应选项D“Management”（即管理/规划）。
解析：题干问作者对无人驾驶汽车的主要担忧是什么。答案句强调政策制定者需思考如何管理无人驾驶汽车的出现，避免延续现有交通系统的弊端，这属于管理层面的问题，对应D项“Management”。A项“Safety”在文中虽被提及，但作者说“rightfully so”，并非其主要担忧；B项“Side effects”是具体问题，不是主要担忧；C项“Affordability”是文中提到的优点，不是担忧。
49. What does the underlined word “fielded” in Paragraph 4 probably mean?
- A. Employed.
- B. Replaced.
- C. Shared.
- D. Reduced.
答案：A
答案句：The first commercially available driverless cars will almost certainly be fielded by ride-hailing services, considering the cost of self-driving technology as well as liability and maintenance issues(责任与维护问题). But driverless car ownership could increase as the prices drop and more people become comfortable with the technology.
参考译文：考虑到自动驾驶技术的成本以及责任和维护问题，第一批商业化的无人驾驶汽车几乎肯定会被叫车服务所采用。但随着价格下降和更多人对该技术感到适应，无人驾驶汽车的拥有量可能会增加。
定位线索：题干“fielded”→答案句所在句“The first commercially available driverless cars will almost certainly be fielded by ride-hailing services”；文中“fielded”对应选项A“Employed”（采用/使用）。
解析：词义题需结合上下文。答案句提到无人驾驶汽车将被叫车服务“fielded”，后文说“driverless car ownership could increase”，说明“fielded”意为“使用/采用”，与A项“Employed”同义。B项“Replaced”（取代）、C项“Shared”（共享）、D项“Reduced”（减少）均不符合语境，属于无中生有。
50. What is the author’s attitude to the future of self-driving cars?
- A. Doubtful.
- B. Positive.
- C. Disapproving.
- D. Sympathetic.
答案：B
答案句：The car of the future is coming. We just have to plan for it.
参考译文：未来的汽车即将到来。我们只需要为之做好规划。
定位线索：题干“attitude to the future”→答案句“The car of the future is coming. We just have to plan for it.”；文中“coming”和“plan for it”体现积极态度，对应选项B“Positive”。
解析：题干问作者对无人驾驶汽车未来的态度。答案句“The car of the future is coming”表明作者认为未来已来，“We just have to plan for it”体现积极应对的态度，对应B项“Positive”。A项“Doubtful”（怀疑的）与“coming”矛盾；C项“Disapproving”（不赞同的）与“plan for it”不符；D项“Sympathetic”（同情的）与文意无关。