相关推荐： 托福阅读材料集锦大全电子版 托福阅读材料集锦大全图片 托福阅读材料集锦大全pdf 托福阅读材料集锦大全及答案
为了让大家提高托福阅读水平，下面小编给大家整理了一些阅读材料，请笑纳~
托福阅读材料之天文学习题
在托福考试中，天文学科也从来都是被重点考察的学科之一。今天就来跟大家分享两道托福TPO模考软件中天文学的阅读题目。
第一道题目来自于TPO 8 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.
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