四级听力短文理解模拟训练第33套_大学英语听力

四级听力短文理解模拟训练第33套

　　27.C

　　细节题。本题询问科学家在Europa这个星球上找到什么?根据问题关键词Europa，a moon of Jupiter锁定到文章中语句Space probes have provided evidence that Europa has a large ocean under its surface.选项C与之相一致。A是说它有许多活火山;B是说它的大气层和地球的相像;D是说它有好儿英里长的洞穴。所以C为正确答案。

　　28.A

　　细节题。本题询问科学家关于生命的形成最近发现了什么?文章末尾提到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.与选项A表述一致。B是说生命可以在很高的温度下形成;C是说每种生命形式都在经历进化;D是说氧气对于有些生命形式来说是不需要的。所以A 为正确答案。

　　听力原文

　　Since early time. people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scientists believed 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 eaves 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.