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