【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. A) Light is not an essential element to it. A) 光不是必备因素。

　　B) Life can form in very hot temperatures. B) 生命在很热的温度下能够形成。

　　C) Every form of life undergoes evolution. C) 每种生命的形成都需要进化。

　　D) Oxygen is not needed for some life forms. D) 氧在生命形成过程中没有必要。

　　【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。

　　原文及译文

　　Since early times, 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 planet 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 the 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 Europa’s 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 ocean. And bacteria, primitive forms of life have been seen there. So the lack of light in Europa’s sub-surface ocean doesn’t automatically rule out life forming.

　　26. What did scientists once believe according to the passage?

　　27. What have scientists found about Europa, a moon of Jupiter?

　　28. What have scientists come to know recently about the formation of life?

　　从很早以前，人们一直迷恋着地球以外的地方也存在生命的想法。直到近来，科学家们认为在其他星球上存在生命只不过是个充满希望的梦。但是，现在他们开始查找可能有生命的地方。1997年，科学家们在恒星附近，例如太阳，发现了行星的踪迹。科学家们现在认为生命可能我们更近，就在太阳系内。科学家们正密切关注的地方是木卫二，木星的一个卫星。太空探测器提供了证据表明木卫二表层之下有一个海洋。探测器也让科学家们认为木卫二表层有散发出火山热的岩石核心。火山活动的水和热量是生命形成的两个基本条件。第三个是一些基本的化学物质，如碳、氧和氮。科学家们认为在木卫二海洋底部可能存在这样的化学成分。他们可能已经创造了生命或即将产生生命。你可能在想光也是生命形成的必要条件。直到最近，科学家们仍认为光是不可或缺的。但现在已经在地球上发现，海洋几英里之下的黑暗的洞穴内有细菌，即原始生命形式的存在。所以不能排除缺乏光的木卫二地下海洋有生命形成的可能性。