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  3. Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere ag

Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere ag

admin2015-01-30  74
问题     Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environments tolerable and some ultraviolet rays penetrate the atmosphere. Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
    Radiation is the greatest known danger to explorers in space. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of(deformed)children or even grandchildren.
    Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far. At present, radiation seems to be the greatest physical hazard to space travelers, but it is impossible to say just how serious the hazard will turn out to be in the future.
Directions: Answer the following questions with the information given in the passage in a maximum of 10 words for each question.
What is the greatest danger to men in space?
选项
答案It is radiation.
解析
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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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