英語四級改錯精練(9)

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There are great many reasons for studying what philosophers 1.________
    have said in the past. One is that we cannot separate the
    history of philosophy from which of science. Philosophy is 2.________
    large discussion about matters on which few people are quite 3.________
    certain, and those few hold opposite opinions. As knowledge
    increases, philosophy buds off the sciences. 
    For an example, in the ancient world and the Middle Ages 4.________
    philosophers discussed motion. Aristotle and St. Thomas
    Aquinas taught that a moving body would slow down until a force 5.________
    were constantly applied to it. They were wrong. It goes on moving
    unless something slows it down. But they had good arguments on
    their side, and if we study these, and the experiments
    which proved them right this will help us to distinguish truth 6.________
    from false in the scientific controversies of today. 7.________