听力首页 听力教程 VOA慢速 英语歌曲 外语下载 英语小说 英语词典 在线背单词 听力论坛 韩语学习
听力专题 英语教材 VOA标准 英语动画 英语考试 资源技巧 英语翻译 单词连连看 听力家园 德语学习
听力搜索 英语导读 BBC英语 英语视频 英语电台 英语QQ群 外语歌曲   英语游戏 英语网刊 日语学习
当前位置: 英语听力论坛 » 【新概念教室】 » 新概念入门第四册 43 PART A
返回列表 发帖

新概念入门第四册 43 PART A


       
       





Lesson 43 Are there strangers in space?

We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start. Of all the planets in our own solar system we arc now pretty certain the Earth is the only one on which life can survive. Mars is too dry and poor in oxygen, Venus far too hot, and so is Mercury, and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres. (1)_______________________. There are one hundred thousand million stars in our own Milky Way alone, and then there are three thousand million other Milky Ways, or Galaxies, in the universe. So the number of stars that we know exist is estimated at about 300 million million million. Although perhaps only 1 per cent of the life that has started somewhere will develop into highly complex and intelligent patterns, so vast is the number of planets that intelligent life is bound to be a natural part of the universe.
If then we are so certain that other intelligent life exists in the universe, why have we had no visitors from outer space yet? (2)_______________________.Professor Ronald Bracewell, a leading American radio-astronomer, argued in Nature that such a superior civilization, on a visit to our own solar system, may-have left an automatic messenger behind to await the possible awakening of an advanced civilization. Such a messenger, receiving our radio and television signals, might well re-transmit them back to its home-planet, although what impression any other civilization would thus get from us is best left unsaid.


本帖隐藏的内容需要回复才可以浏览

进来学习一下新概念英语,提升自我

TOP

thank you

TOP

返回列表