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- 共用题干 More Than 8 Hours Sleep Too Much of a Good Thing1 Although the dangers of too little sleep are...
- 共用题干 Energy and Public LandsThe United States boasts substantial energy resources. Federal lands pr...
- 共用题干 Every Dog Has His SayKimiko Fukuda always wondered what her dog was trying to say. Whenever sh...
- 共用题干 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 第二篇Saving MoneyWhere you save your money often depends on what you are saving for. If you are ...
- He could not tolerate the extremes of heat in the desert.
- 共用题干 Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exete...
- 共用题干 Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the s...
- 共用题干 Ford1 Fords great strength was the manufacturing process一not invention.Long before he started ...