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- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- 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,...
- Primer on Smell In addition to bringing out1 the flavor of food, what does the sense of smell do...
- 共用题干 Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary schoo...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 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 Female BullfightingIt was a unique,eye-catching sight:an attractive woman in a shiny bullfight...
- 共用题干 Cloning（克隆）:Future Perlect?1 A clone is an exact copy of a plant or animal produced from any o...
- 共用题干 Thirst for OilWorldwide every day,we devour the energy equivalent of about 200 million barrels...
- 共用题干 第二篇Credit Card Only Works When Spoken ToA credit card that will not work unless it hears its o...