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- 共用题干 第一篇Almost Human?Scientists are racing to build the worlds first thinking robot.This is not sci...
- 共用题干 Walk a Quarter-Mile or DiemIf you can walk a quarter-mile,odds（可能性）are you have at least six y...
- 共用题干 U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast ...
- 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A ...
- 共用题干 Travel Across AfricaFor six hours we shot through the barren（荒芜的）landscape of the Karoo desert...
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 第二篇Crystal EarOne day a friend asked my wife Jill if I wanted a hearing aid.He certainly does,...
- 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A ...
- 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Okla...