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- 共用题干 You Need Courage!Shortly after I began a career in business,I learned that Carl Weatherup,pres...
- 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,...
- Techniques to employ the energy of the sun are being developed.
- 共用题干 Unpopular Subjects?Is there a place in todays society for the study of useless subjects in our...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary schoo...
- 共用题干 Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growi...
- 共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...
- What puzzles me is why his books are so popular.
- 共用题干 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...