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- 共用题干 Save Energy At HomeOn the average,Americans waste as much energy as two-thirds of the worlds p...
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 共用题干 Batteries Built by VirusesWhat do chicken pox,the common cold,the flu,and AIDS have in common?...
- 共用题干 The Forbidden AppleNew York used to be the city that never sleeps. These days its the city tha...
- 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 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...
- 共用题干 The Difference between Man and ComputerWhat makes people different from computer programs?What...
- 共用题干 第一篇Pushbike DangerLow speed bicycle crashes can badly injure一or even kill一children if they fal...
- He was tempted by the high salary offered by the company.
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...