Questions:
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?
26.C
细节题。本题询问科学家曾经相信什么事实?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.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。所以C为正确答案。
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。
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