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托福阅读句子简化题：Running Water on Mars

2015-08-17 15:38:18来源：网络

　　【托福阅读题型：Running Water on Mars句子简化题】托福阅读中句子简化题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子简化题

　　托福阅读句子简化题：Running Water on Mars

　　【Paragraph 4】These ideas remain controversial. Proponents point to features such as the terraced “beaches”　shown in one image, which could conceivably have been left behind as a lake or ocean evaporated and the shoreline　receded. But detractors maintain that the terraces could also have been created by geological activity, perhaps related to　the geologic forces that depressed the Northern Hemisphere far below the level of the south, in which case they havenothing whatever to do with Martian water. Furthermore, Mars Global Surveyor data released in 2003 seem to indicate　that the Martian surface contains too few carbonate rock layers—layers containing compounds of carbon and oxygen—　that should have been formed in abundance in an ancient ocean. Their absence supports the picture of a cold, dry Mars　that never experienced the extended mild period required to form lakes and oceans. However, more recent data imply　that at least some parts of the planet did in fact experience long periods in the past during which liquid water existed on　the surface.(Running Water on Mars)

　　Which of the sentences below best expresses the essential information in the highlighted sentence in the　passage? Incorrect choices change the meaning in important ways or leave out essential information.

　　○But detractors argue that geological activity may be responsible for the water associated with the terraces.

　　○But detractors argue that the terraces may have been formed by geological activity rather than by the presence　of water.

　　○But detractors argue that the terraces may be related to geological forces in the Northern Hemisphere of Mars,　rather than to Martian water in the south.

　　○But detractors argue that geological forces depressed the Northern Hemisphere so far below the level of the　south that the terraces could not have been formed by water



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