[originaltext] (20)Since early times, people have been fascinated with the

游客2023-08-22  27

问题  
(20)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.(21)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.(22)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 lie at the bottom of Europa’s ocean. They may have already created life or may be about to.(22)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 20 to 22 are based on the passage you have just heard.
20. What did scientists once believe according to the passage?
21. What have scientists found about Europa, a moon of Jupiter?
22. What have scientists come to know recently about the formation of life?

选项 A、Light is not an essential element to it.
B、Life can form in very hot temperatures.
C、Every form of life undergoes evolution.
D、Oxygen is not needed for some life forms.

答案 A

解析 细节题。来自火山的水和热是形成生命的基本环境。基本的化学物质也是必要的,比如碳、氧气、氮。直到最近,科学家们都认为光线是必需的。但是现在地球上发现了一些完全黑暗的地方,比如地球表面几英里以下的洞穴。题目问的是科学家最近发现的有关生命组成的消息,故选A。
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