2013年大学英语六级改错试题及答案（18）

2013年大学英语六级改错试题及答案汇总

　　Some people, in all seriousness, say that humans will be living in space within the next hundred or so years. Planet Earth will be crowded, dirty and lack of resources. A sort of exodus [51] of mankind will begin.

　　Spaceships will be assembled so that they revolve around the earth. Some may orbit around Mars. These space stations will be serviced by space buses. We saw the first space bus launch in [52] April 1981. This was ""Columbia"", it made several [53] orbits around the earth and then returned, landing on a huge dry lake bed in California. ""Columbia"" will be used again. Previous spaceships have been abandoned, only the nose being used to bring the crews back to earth.[54]

　　Upon established, each space station will [55] generate its own atmosphere and have its own agriculture. It will need to rotation to provide [56] an artificial gravity; people will be forced inwards [57] from the centre by centrifugal force.

　　The moon and Mars could become new sources of new materials. Driving through space will no [58] longer need Earth fuel - the energy would come from the sun. This energy would be converted from [59] electricity to work magnetic rockets.

　　That all sounds quite fantastically but, with [60] the rapid development of modern technology, who knows about what the future holds?

　　答案

　　51. and lack of... short

　　52. bus launch in... launched

　　53. it made several... which

　　54. the crews back... crew

　　55. Upon established... once

　　56. to rotation to... rotate

　　57. forced inwards... outwards

　　58. space will no... would

　　59. converted from... into

　　60. quite fantastically but... fantastic

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