题目

Flying cars may soon become a ___61___(real). The rideshare service Uber has asked __62__ expert from NASA, the American space agency, __63___(help) the company develop cars that can fly. Uber plans to use flying vehicles ___64__the future to avoid traffic in and around cities. The company wants to use small, totally electric aircraft, ___65__could take off and land like a helicopter on top of parking garages. Uber said its flying vehicles would be much __66___(quiet), cost less to operate and produce less pollution than helicopters. One person in San Francisco__67__(write) on Twitter, “I used to think flying cars was a ridiculous idea. ___68__ I changed my mind this morning when I sat in heavy traffic.” Another person added from Mumbai, India: “I’m reading about Uber ___69___(hire) a NASA engineer to build flying cars, while I’m stuck in traffic. There is hope.” The expert predicts there will be several early models of flying cars that can’t fly ___70__(they) but with human pilots within one to three years. 答案：       61. reality           62. an          63. to help          64. in                   65. which 66. quieter          67. wrote     68. But                69. hiring            70. themselves

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