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.
【C8】

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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