Why should man take the trouble of conquering space? It is hard to list the specific practical benefits that will result in. But one knows, from past experience in other areas, that man will surely see and discover new things in space that will increase our scientific knowledge, and this new knowledge will find its way into valuable practical uses. What we learn about man himself, from his
experience in space, and from the effects of space and the space flight environment on him, will be extremely valuable. The new techniques developed to carry out the exploration of space, and to keep man alive in space, will certainly find practical uses in everyday life in some way. The areas that will benefit are manifold. They include communication, generation of power, transportation and travel, food production, materials, fuels and many others. But to say definitely just what the practical_results will be is almost impossible.
5.The main idea of the first paragraph is that ________.
A.man often goes wherever his dreams go
B.man desires to explore what is unknown
C.man is no longer interested in the study of the land and sea now
D.man's history is his exploration of the world
答案:B 主旨归纳题。由第一段首句和第三句可知此段在说“人类渴望探索未知的世界”。选项A和D是片面的,而选项C在此段没有被提及。故正确答案为B。
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