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2009年高考英语完形填空课堂练习六
A
Mars is not, it seems, the dry old planet we once believed 1 ．Astronauts who are 2 to go there in the next decade may find plenty 3 water to slake （消除） their thirst．And with water present the 4 of finding some sort of life of Mars are （5） brighter．
This is the view of forty geologists who have been analyzing 6 of pictures and other scientific 7 obtained by robot explorers in the sixties and seventies．
To begin with, scientists thought the Red planet was as 8 as the Moon 9 dust storms swirling over vast sandy 10 ．But now the picture is very different 11 mountains and valleys carved by 12 glaciers and rivers rushing and rumbling deep underground．
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