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[求助] 求问TPO8 第三篇阅读的总结题 [复制链接]

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发表于 2014-8-2 12:18:32 |只看该作者 |倒序浏览
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○Mars’ runoff and outflow channels are large-scale, distinctive features that suggest that large quantities of liquid water once flowed on Mars.
○Although some researchers claim that Mars may once have had oceans, others dispute this, pointing to an absence of evidence or offering alternative interpretations of evidence.   
○Various types of images have been used to demonstrate that most of Martian surface contains evidence of flowing water.
○The runoff and outflow channels of Mars apparently carried a higher volume of water and formed more extensive networks than do Earth’s river systems.
○There is very little evidence of liquid water on Mars today, and it is assumed that all the water that once existed on the planet is frozen beneath its surface.
○While numerous gullies have been discovered on Mars since 2000, many astronomers dismiss them as evidence that Mars once had liquid water.

不明白为什么不选various types of……那一句,是因为文中没有用到various  types of images,而是只用到了一种image么?
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RE: 求问TPO8 第三篇阅读的总结题 [修改]
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求问TPO8 第三篇阅读的总结题
https://bbs.gter.net/thread-1757940-1-1.html
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