●首页 加入收藏 网站地图 热点专题 网站搜索 [RSS订阅] [WAP访问]  
语言选择:
英语联盟 | www.enun.cn
英语学习 | 英语阅读 | 英语写作 | 英语听力 | 英语语法 | 综合口语 | 考试大全 | 英语四六 | 英语课堂 | 广播英语 | 行业英语 | 出国留学
品牌英语 | 实用英语 | 英文歌曲 | 影视英语 | 幽默笑话 | 英语游戏 | 儿童英语 | 英语翻译 | 英语讲演 | 求职简历 | 奥运英语 | 英文祝福
背景:#EDF0F5 #FAFBE6 #FFF2E2 #FDE6E0 #F3FFE1 #DAFAF3 #EAEAEF 默认  
阅读内容

2010年四级考试模拟试题及答案(最新)

[日期:2008-04-23]   [字体: ]
Part III Reading Comprehension (35 minutes)
  Direction: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B) C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.

  Passage One
  Questions 51 to 55 are based on the following passage:
  Space is a dangerous place, not only because of meteors(流星)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 environment endurable. Various kinds of rays 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 unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. 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(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.
  51. According to the first paragraph, the atmosphere is essential to man in that ______.
  A) it protects him against the harmful rays from space
  B) it provides sufficient light for plant growth
  C) it supplies the heat necessary for human survival
  D) it screens off the falling meteors
  52. We know from the passage that ________.
  A) exposure to even tiny amounts of radiation is fatal
  B) the effect of exposure to radiation is slow in coming
  C) radiation is avoidable in space exploration
  D) astronauts in spacesuits needn't worry about radiation damage
  53. The harm radiation has done to the Apollo crew members _______.
  A) is insignificant
  B)seems overestimated
  C) is enormous
  D) remains unknown
  54. It can be inferred from the passage that ________.
  A) the Apollo mission was very successful
  B) protection from space radiation is no easy job
  C) astronauts will have deformed children or grandchildren
  D) radiation is not a threat to well-protected space explorers
  55. The best title for this passage would be _______.
  A) The Atmosphere and Our Environment
  B) Research on Radiation
  C) Effects of Space Radiation
  D) Importance Protection Against Radiation
上一页123456789..11下一页  GO
   免责声明:本站信息仅供参考,版权和著作权归原作者所有! 如果您(作者)发现侵犯您的权益,请与我们联系:QQ-50662607,本站将立即删除!
 
阅读:

推荐 】 【 打印
相关新闻       四级 
本文评论       全部评论
发表评论

点评: 字数
姓名:
内容查询

热门专题
 图片新闻