2. 外语
  3. The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astronauts will acquire a workhouse vehicle【C

The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astronauts will acquire a workhouse vehicle【C

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问题     The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astronauts will acquire a workhouse vehicle【C2】______of flying into space and returning many times. 【C3】______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. 【C4】______more significantly, it will deliver materials and machines into space for industrial purposes【C5】______two decades ago when "sputnik" (artificial satellite) was added to the vocabulary. In short, the【C6】______importance of the shuttle lies in its promise as an economic tool.
    What makes the space shuttle【C7】______is that it takes off like a rocket but lands like an air-plane. 【C8】______when it has accomplished its mission, it can be ready for【C9】______trip in about two weeks.
    The space shuttle, the world’s first true spaceship, is a magnificent step【C10】______making the impossible possible for the benefit and survival of man.
【C4】
选项 A、Then
B、Or
C、But
D、So
答案C
解析 上句讲航天飞机在军事和科研方面的重要性，本句指出它的作用在工业方面却更为重要，所以要用连词But表示转折递进的关系。Then“然后，之后”多用来表示时间上的顺序。Or“或者；否则”一般表示选择，且很少放在句首。So一般引导表示结果的句子，这里没有因果关系，故在这里也不合适。
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