2. 外语
  3. The key to the industrialization of space is the U. S. space shuttle.【51】it, astronauts will acquire a workhouse vehicle【52】of f

The key to the industrialization of space is the U. S. space shuttle.【51】it, astronauts will acquire a workhouse vehicle【52】of f

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问题     The key to the industrialization of space is the U. S. space shuttle.【51】it, astronauts will acquire a workhouse vehicle【52】of flying into space and returning many times. 【53】by reusable rockets that can lift a load of 65 000 pounds, the shuttle will carry devices for scientific inquiry, as well as a variety of military hardware.【54】more significantly, it will deliver materials and machines into space for industrial purposes【55】two decades ago when "sputnik" (artificial satellite) was added to the vocabulary. In short, the【56】importance of the shuttle lies in its promise as an economic tool.
    What makes the space shuttle【57】is that it takes off like a rocket but lands like an air plane. 【58】when it has accomplished its mission, it can be ready for【59】trip in about two weeks.
    The space shuttle, the world’s first true spaceship, is a magnificent step【60】making the impossible possible for the benefit and survival of man.
选项 A、for
B、by
C、in
D、through
答案C
解析 a step in doing sth. 表示在某一方面取得的进步或进展，是惯用法。for后面常表示目的，by与through常表示手段、方法，这三个介词都不能正确地表达句子的意思。
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