In the last paragraph，the writer implies that there is a long way to go        ．

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• 1In the race，the greatest distance one vehicle covered was            ．

  A.about eight miles

  B.six miles

  C.almost two miles

  D.about one mile

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• 2From the passage，we know “robotic vehicles” are a kind of machines that        ．

  A.can do effortlessly whatever tasks living things can

  B.can move from place to place without being driven by human beings

  C.can show off their ability to turn themselves upside down

  D.can take part in a race across 142 miles with a time limit

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• 3DARPA organized the race in order to        ．

  A.raise money for producing more robotic vehicles

  B.push the development of vehicle industry

  C.train more people to drive in the desert

  D.improve the vehicles for future wars

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• 4Watchers doubted if any of the vehicles could finish the race because        ．

  A.they did not have any human guidance

  B.the road was not familiar to the drivers

  C.the distance was too long for the vehicles

  D.the prize money was unattractive to the drivers

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• 5What is the best title for the passage、

  A.Laos: slow-developing nations

  B.Laos: small steps forward

  C.Laos: least-developed land

  D.Laos: landlocked country

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