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、Thus
B、Whereas
C、Nevertheless
D、Yet
答案A
解析 从上下文看，前后句是因果关系。由于上句提到的特点，航天飞机能在完成任务两周后做好准备执行新的任务。Thus用来引出表示结果的句子，是正确答案。Whereas“反之；在另一方面”，Nevertheless“然而，尽管如此”，Yet“然而”这三个词都表示意思上的转折，因而都不适用。
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