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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
admin
2012-02-27
49
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、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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