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、exceptional
B、strange
C、unique
D、rare

答案C

解析 虽然四个词都有“与众不同,不一般;不普遍”等含义,但侧重点不同。exceptional强调“例外的;异常的,特别的”;strange意为“奇怪的,奇特的;过去没见过的”;rare指“不多见的,罕见的”。既能像火箭那样腾空而起,又能像飞机那样徐徐降落,这是航天飞机的独特之处,所以正确的选择是unique,作“独一无二的,独特的”讲。
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