第九篇： Error Correction （15 minutes） 

　　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 ――71.
　　（移居） 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 ――72.
　　April 1981. This was "Columbia", it made several ――73.
　　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 cone being used
　　to bring the crews back to earth. ――74.
　　Upon established, each space station will ――75.
　　generate its own atmosphere and have its own
　　agriculture. it will need to rotation to provide ――76.
　　an artificial gravity; people will be forced inwards ――77.
　　from the center by centrifugal（向心的）force.
　　The moon and Mars could become new sources of
　　new materials. Driving through space will no ――78.
　　longer need Earth fuel-the energy would come
　　from the sun. This energy would be converted from ――79.
　　electricity to work magnetic rockets.
　　That all sounds quiet fantastically but, with ――80.
　　the rapid development of modern technology, who
　　knows about what the future holds?

　　答案：　　71. sort ―― short
　　72. launch ―― launched
　　73. it ―― which
　　74. crews ―― crew
　　75. Upon ―― Once
　　76. rotation ―― rotate
　　77. inward ―― outwards
　　78. will ―― would
　　79. from ―― into
　　80. fantastically ―― fantastic