四级听力短文理解模拟训练第34套_大学英语听力

四级听力短文理解模拟训练第34套

　　27、听音指导通过选项即可确定本题为对于某一事物的细节描述题，所以首先要解决各选项中it所指的内容。由第一题选项可初步推测，本题很可能考查的是对一个星球的描述。

　　正确项分析问题为科学家在木卫二星球上找到什么，那么应该是Space probes have provided evidence that Europa has a large ocean under its surface，意为航空观测镜发现了星球表面下有个大的海洋。C选项与原文一模一样。

　　28、听音指导根据惯例，最后一个问题答案出现在篇章结束前三十秒左右，选项均涉及生命形成因素，分别为light，hot temperatures，evolution和oxygen，根据这些信息，可轻易在短文结束前找到答案。

　　正确项分析注意转折连词but前后，原文为Until recently, scientists thought that light was essential. But now, places have been found on earth that are in total blackness such as caves several miles beneath the ocean. And bacteria, primitive forms of life, have been seen there。意为科学家一直以为光是很重要的，但是现在他们发现完全黑暗的地方比如几英里深的洞里，也有生命，即细菌。可见，光不是必备因素，选项A正确。

　　听力原文

　　Passage 1

　　Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scientists believe that life on other planets was just a hopeful dream. 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. The probes have also made scientists think that under its surface Europa has a rocky core giving off volcanic heat. 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 Europas ocean. They may have already created life or may be about to. You may wonder if light is also needed for life to form. Until recently, scientists thought that light was essential. But now, places have been found on earth that are in total blackness such as caves several miles beneath the surface. And bacteria, primitive forms of life, have been seen there. So the lack of light in Europas sub-surface ocean doesnt automatically rule out life forming.