外语教育网
您的位置:外语教育网 > 考试英语 > 专四专八 > 经典题库 正文
  • 站内搜索:

英语专八考前自测冲刺题:改错下

2006-07-04 13:12

  Mars has provoked much speculation on the possibili- (1)

  ties of life beyond Earth than any 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 guide-

  line for the exploration of a red planet. Although Mars experi- (4)

  ences seasons like on Earth and has polar caps which com- (5) __

  posed of carbon dioxide and water ice, today it is bone-dry and

  frigidly cold. But evidence is rapidly accumulating Mars was (6) __

  once much wetter, with a more clement climate. This evidence

  comes from orbiting satellites and from data collected by rov-

  ing landers.

  Since 1970s, space probes to Mars have revealed numer- (7) __

  ous features apparent carved by flowing water, such as wind-

  Lng, branched valleys resembling dried-out streambeds and gi-

  ant outflow channels gouged by catastrophic floods. Recent

  high-resolution imagery from the Mars Global Surveyor Mars

  Orbiter Camera and the Mars Odyssey THEMIS reveal nu- (8) __

  merous examples of branched valleys that form tightly-packed,

  integrated drainage systems. These channels origins at topo- (9) __

  graphic high points; the valleys widen “downstream”, some

  even displaying inner valleys. The valley networks exhibit

  morphometric characteristics, including network densities,

  comparative to those of terrestrial drainage basins. These fea- (10) __

  tures were most likely produced by rainfall, during wetter,

  warmer periods in the past.

相关热词:专四 专八 复习 指导
考试英语系列辅导课程
周 涵著名职称英语辅导专家,十余年职称英语教学实践……详情>>
周涵:职称英语辅导名师
赵文通资深学位英语辅导专家,深谙命题方向及重点、难点……详情>>
赵文通:学位英语考试辅导名师
冉继军北京大学博士,知名高校教师,雅思权威辅导专家……详情>>
冉继军:雅思考试辅导名师

  1、凡本网注明 “来源:外语教育网”的所有作品,版权均属外语教育网所有,未经本网授权不得转载、链接、转贴或以其他方式使用;已经本网授权的,应在授权范围内使用,且必须注明“来源:外语教育网”。违反上述声明者,本网将追究其法律责任。
  2、本网部分资料为网上搜集转载,均尽力标明作者和出处。对于本网刊载作品涉及版权等问题的,请作者与本网站联系,本网站核实确认后会尽快予以处理。本网转载之作品,并不意味着认同该作品的观点或真实性。如其他媒体、网站或个人转载使用,请与著作权人联系,并自负法律责任。
  3、联系方式
  编辑信箱:for68@cdeledu.com
  电话:010-82319999-2371