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 » 【四级教室】 » 四级练习2014.05.04
返回列表 发帖

四级练习2014.05.04


       
       




Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. (1)______________________. But now they are beginning to locate places where life could form. In 1997, they saw evidence of planets near other stars like the sun. But scientists now think that life could be even nearer in our own solar system. One place scientists are studying very closely is Europa, a moon of Jupiter. Space probes have provided evidence that Europa has a large ocean under its surface. (2)___________________________. Water and heat from volcanic activity are two basic conditions needed for life to form. A third is certain basic chemicals such as carbon, oxygen and nitrogen. Scientists believe there might be such chemicals lying at the bottom of Europa’s ocean. They may have already created life, or maybe about to. You may wonder if light is also need for life to form. Until recently, scientists thought that light was essential. But now, (3)______________________________. And bacteria, primitive forms of life have been seen there. So the lack of light in Europa’s subsurface ocean doesn’t automatically rule out life forming.




本帖隐藏的内容需要回复才可以浏览

until recently scientists believe that life on other planet was just hope for dream
the probe have also made scientist think that under it's surface Europa has rocky coal giving volcanic hit
place having been found on earththat aer in total black such in cave several miles in it's surface

TOP

返回列表