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  3. The key to the industrialization of space is the U. S. space shuttle.【51】it,

The key to the industrialization of space is the U. S. space shuttle.【51】it,

游客2025-03-25  12
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. [br]
选项 A、general
B、essential
C、prevailing
D、ultimate
答案 D
解析 本句的意思是：航天飞机最根本的重要性在于它能作为经济工具的前景。general表示“一般的；总的”，essential表示“基本的；最重要的”，prevailing表示“普遍的，流行的”，在这里都不合适。只有ultimate“终极的；根本的；最主要的”符合题意并能同importance搭配使用。
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