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外语
A、There were no planets without moons. B、There was no air or water on Jupiter. C、Life was not possible in outer space. D、The mys
A、There were no planets without moons. B、There was no air or water on Jupiter. C、Life was not possible in outer space. D、The mys
admin
2013-06-03
34
问题
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 place scientists are studying very closely is Europa, a moon of Jupiter. Space probes have provided evidence that Europa has a large ocean tinder 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 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 surface. 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.
Questions:
What did scientists once believe according to the passage?
What have scientists found about Europa, a moon of Jupiter?
What have scientists come to know recently about the formation of life?
选项
A、There were no planets without moons.
B、There was no air or water on Jupiter.
C、Life was not possible in outer space.
D、The mystery of life could not be resolved.
答案
C
解析
Question: What did scientists once believe according to the passage?
本题为细节题。本题询问"科学家曾经(once)相信什么事实?"根据问题关键词once可以定位到文章第二句的关键词until recently,意为曾经如何,过去一直认为如何。原文是Until recently,scientists believed that life on other planets was just a hopeful dream.(过去科学家一直认为其他星球上存在生命只是个美好的愿望)。也就是他们认为外太空不可能存在生命,与答案C相符。A是说所有星球都会有卫星;B是说木星上没有空气或水;D是说生命的奥秘不能被解开。
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0
大学英语四级
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