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GRE阅读解析:天外星体存在生命

2016-04-06 16:22:11来源:网络
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  3月12日很多同学都遇到了,一起来体会下这篇文章,试着做下题目呀!

  Thediscovery of subsurface life on Earth, surviving independently from surfacelife, refuted the belief that biological processes require not only liquidwater but sunlight as well, thus greatly enhancing the possibility of lifebeyond Earth. Take Jupiter’s moonEuropa. Space probes show a body covered with a thick layer of ice. AsEuropa orbits its planet, however, it flexes due to the gravitationaltug-of-war between it, its sister moons, and Jupiter. Through friction, thisflexing produces heat in the moon’s interior capable of melting ice. Indeed,observations suggest liquid water exists beneath Europa’s icy crust.Photosynthetic life is impossible there because sunlight is completely absent,but life such as the microbes that flourish deep within earth may still bepossible.

  The highlighted sentence “take Jupiter’s moon Europa” serves tointroduce

  A. aninstance that allows a hypothesis to be tested

  B. speculationgrounded in empirical discovery

  C. a deductionfrom a newly advanced hypothesis

  D. alarge-scale effect of an apparently insignificant contingency

  E. thederivation of a contradiction to refute a claim

  思考ING...

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