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- 共用题干 Robots May Allow Surgery in SpaceSmall robots designed by University of Nebraska researchers m...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 Energy and Public LandsThe United States boasts substantial energy resources. Federal lands pr...
- 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Okla...
- The sea turtles natural habitat has been considerably reduced.
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 DVD for Rent1.A pay-for-play system for video DVD will emerge by summer as an alternative,a...
- 共用题干 The Greatest Mystery Of WhalesThe whale is a warm-blooded,air-breathing animal,giving birth to...
- She stood there，trembling with fear.