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- 共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells...
- 共用题干 第三篇Renewable Energy SourcesToday petroleum（石油）provides around 40% of the worlds energy needs ,...
- An important part of the national government is the Foreign Service,a branch of the Department of St...
- 共用题干 A Doctor in the HouseBrushing your teeth twice a day should keep the dentist away. But if a gr...
- 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 第三篇Almost Human?Scientists are racing to build the worlds first thinking robot.This is not sci...
- 共用题干 New Product Will Save livesDrinking water that looks clean may still contain bugs（虫子）,which ca...
- 共用题干 Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exete...
- 共用题干 第一篇Motoring Technology1.2 million road deaths worldwide occur each year,plus a further 50 mill...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...