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专八改错集训营附答案和解析(74)

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Mars has provoked much speculation on the possibilities of __1__life on Earth than any other planet in the Solar System. __2__The presence of water is a prerequisite for the existing of life. __3__Therefore, “follow the water” has been NASA’s chief guideline for the exploration of a red planet. Although Mars experiences __4__seasons like on Earth and as polar caps which composed __5__of carbon dioxide and water ice, today it is bone-dry and frigidly cold. But evidence is rapidly accumulating that Mars is once __6__much wetter, with a more clement climate.
This evidence comes from orbiting satellites and from data collected by roving landers.Since the 1970s, space probes of Mars have revealed __7__numerous features apparently craved by flowing water, such as winding, branched valleys resembling driedout streambeds and giant outflow channels gouged by catastrophic floods.Recent high-resolution imagery from the Mars Odyssey Themis reveal numerous examples of branched valleys that from __8__tightly-packed integrated drainage system. These channels origins at topographic high points; the valleys widen “downstream”, __9__some even displaying inner valleys. The valley networks densities,comparative to those of terrestrial drainage basins. __10__ These features were most likely produced by rainfall, during wetter, warmer periods in the past.   

重点单词   查看全部解释    
numerous ['nju:mərəs]

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adj. 为数众多的,许多

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reveal [ri'vi:l]

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vt. 显示,透露
n. (外墙与门或窗之间的

 
flowing ['fləuiŋ]

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adj. 流动的;平滑的;上涨的 v. 流动;起源;上涨

 
presence ['prezns]

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n. 出席,到场,存在
n. 仪态,风度

 
planet ['plænit]

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n. 行星

 
originate [ə'ridʒineit]

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vt. 发起
vi. 开始
[计算机

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terrestrial [ti'restriəl]

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n. 地球上的人 adj. 地球的,地上的

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exploration [.eksplɔ:'reiʃən]

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n. 探险,踏勘,探测

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drainage ['dreinidʒ]

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v. 排水
n. 排水系统,污水

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speculation [.spekju'leiʃən]

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n. 沉思,推测,投机

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