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- 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 The FamilyThe structure of a family takes different forms around the world and even in the sam...
- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- The study also notes a steady decline in the number of college students taking science courses.
- 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 第一篇Almost Human?Scientists are racing to build the worlds first thinking robot.This is not sci...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 The Difference between Man and ComputerWhat makes people different from computer programs?What...
- 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 Memory Test1 I am going to give you five techniques that will enable you to remember anything ...