英语四级改错练习题 第013组
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简答题（共1题。）。
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? (本题0 分)
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? (本题0 分)
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