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  3. Discovery of Europa Since early times, people have been【C1】______(fascination)with the idea of life existing somewhere else

Discovery of Europa Since early times, people have been【C1】______(fascination)with the idea of life existing somewhere else

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问题                             Discovery of Europa
    Since early times, people have been【C1】______(fascination)with the idea of life existing somewhere else besides earth. Until recently, scientists believe that life on other planets was just a【C2】______(hope)dream. But now they are beginning to locate places where life could form. In 1997, they saw【C3】______(evident)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【C4】______(close)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【C5】______ (give)off volcanic heat. Water and heat from volcanic activity are two basic conditions【C6】______(need)for life to form. A third is certain basic chemicals such as carbon, oxygen and nitrogen. You may【C7】______(wonderful)if light is also needed for life to form. Until recently, scientists thought that light was【C8】______(essentially). 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【C9】______(automatic)rule out life 【C10】______ (form).
【C6】
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答案needed
解析 本句主谓结构完整，分析句法结构可发现，空白处连同空后一起用来修饰名词conditions，condition在句子中和need的关系应属被动，即形成生命所需要的基本条件，因此，把提示词动词need改成过去分词needed符合句意。
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