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- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 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 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 共用题干 High-Tech Warfare（战争）Today,high-tech warfare is no longer an abstract concept,but a real issue...
- 共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin ...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A ...
- 共用题干 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...