The urge to explore is innate in Man.【C1】______ his imagination roams, Man

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问题 The urge to explore is innate in Man.【C1】______ his imagination roams, Man seeks also to go. A large part of history is concerned【C2】______ the exploration of the world in which we live.【C3】 men have set out with amazing courage and fortitude to【C4】______ into unknown regions and lands. They crossed the sea in【C5】______ boats,traversed continents, scaled mountains, fought their way through jungles and swamps, endured【C6】______ hardships — all to explore, to see what had not yet been seen, to make【C7】______ the unknown. Nor did Man confine his movements 【C8】______ the surface of land and sea. With kites, balloons and aircraft he left the ground and to【C9】______ through the lower atmosphere. Now outer space receives his attention.
The hard way to answer the question, why should Man bother about【C10】______ space, is to attempt to list the specific practical benefits【C11】______ result. One knows, from past experience in other areas, that Man will【C12】______ see and discover new things in space. That will increase our store of scientific knowledge, and this new knowledge will find its way 【C13】______ valuable practical uses.【C14】______ about Man himself, from his experience in space, and from the effects of space and the space flight【C15】______ environment, will be invaluable. The new techniques developed to carry out the exploration of space, and to keep men【C16】______ in space, will inevitably be put into valuable practical uses in everyday life. The areas that will benefit are.【C17】______ .They include communications, generation, transportation and travel, food production,【C18】______ of resources, navigation, human comfort and welfare, biology and medicine, materials, fuels and many others.【C19】______ to state specifically just what the practical outcomes will be is【C20】______ impossible. [br] 【C14】

选项 A、What we learn
B、That we learn
C、Where we learn
D、When we learn

答案 A

解析结构衔接题。分析句子成分，可以知道will be invaluable是谓语部分，本句没有主语，就需要填主语从句。在四个选项中，只有What we learn的表述最完全，使句意符合逻辑：我们从人类的太空经历中，从太空和太空飞行环境对人类的影响中获得的关于人类自身的信息，其价值是不可估量的。

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