[专八]英语专八考前自测冲刺题：改错（二）*

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英语专八考前自测冲刺题：改错（二）湖南校园网 www.sunnyol.com


      Mars has provoked much speculation on the possibili- (1)湖南校园网 www.sunnyol.com

ties of life beyond Earth than any planet in the Solar System. (2) __湖南校园网 www.sunnyol.com
The presence of water is a prerequisite for the existing of life. (3) __湖南校园网 www.sunnyol.com
Therefore, "follow the water" has been NASA' s chief guide-湖南校园网 www.sunnyol.com
line for the exploration of a red planet. Although Mars experi- (4)湖南校园网 www.sunnyol.com
ences seasons like on Earth and has polar caps which com- (5) __湖南校园网 www.sunnyol.com
posed of carbon dioxide and water ice, today it is bone-dry and湖南校园网 www.sunnyol.com
frigidly cold. But evidence is rapidly accumulating Mars was (6) __湖南校园网 www.sunnyol.com
once much wetter, with a more clement climate. This evidence湖南校园网 www.sunnyol.com
comes from orbiting satellites and from data collected by rov-湖南校园网 www.sunnyol.com
ing landers.湖南校园网 www.sunnyol.com
      Since 1970s, space probes to Mars have revealed numer- (7) __湖南校园网 www.sunnyol.com
ous features apparent carved by flowing water, such as wind-湖南校园网 www.sunnyol.com
Lng, branched valleys resembling dried-out streambeds and gi-湖南校园网 www.sunnyol.com
ant outflow channels gouged by catastrophic floods. Recent湖南校园网 www.sunnyol.com
high-resolution imagery from the Mars Global Surveyor Mars湖南校园网 www.sunnyol.com
Orbiter Camera and the Mars Odyssey THEMIS reveal nu- (8) __湖南校园网 www.sunnyol.com
merous examples of branched valleys that form tightly-packed,湖南校园网 www.sunnyol.com
integrated drainage systems. These channels origins at topo- (9) __湖南校园网 www.sunnyol.com
graphic high points; the valleys widen "downstream", some湖南校园网 www.sunnyol.com
even displaying inner valleys. The valley networks exhibit湖南校园网 www.sunnyol.com
morphometric characteristics, including network densities,湖南校园网 www.sunnyol.com
comparative to those of terrestrial drainage basins. These fea- (10) __湖南校园网 www.sunnyol.com
tures were most likely produced by rainfall, during wetter,湖南校园网 www.sunnyol.com
warmer periods in the past. 湖南校园网 www.sunnyol.com






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