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托福阅读句子插入题：Running Water on Mars

2015-08-18 16:14:18来源：网络

　　【托福阅读题型：Running Water on Mars句子插入题】托福阅读中句子插入题是重要题型之一。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插入题

　　托福阅读句子插入题：Running Water on Mars

　　【Paragraph 2】Outflow channels are probably relics of catastrophic flooding on Mars long ago. ■They appear only　in equatorial regions and generally do not form extensive interconnected networks. ■Instead, they are probably the paths　taken by huge volumes of water draining from the southern highlands into the northern plains. ■The onrushing water　arising from these flash floods likely also formed the odd teardrop-shaped “islands” (resembling the miniature versions　seen in the wet sand of our beaches at low tide) that have been found on the plains close to the ends of the outflow　channels. ■Judging from the width and depth of the channels, the flow rates must have been truly enormous—perhaps　as much as a hundred times greater than the 105 tons per second carried by the great Amazon river. Flooding shaped　the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.　(Running Water on Mars)

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　These landscape features differ from runoff channels in a number of ways.

　　Where would the sentence best fit?

　　答案见下一页：

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