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- 共用题干 Where Has the Salt Come from?Every now and then,we meet a fact about our earth that makes us f...
- 共用题干 Animals “Sixth Sense”A tsunami（海啸）was triggered（引发）by an earthquake in the Indian Ocean in Dec...
- 共用题干 Forests for CitiesYou are standing in a beautiful forest in Japan. The air is clean and smells...
- The sea turtles natural habitat has been considerably reduced.
- 共用题干 Energy and Public LandsThe United States boasts substantial energy resources. Federal lands pr...
- 共用题干 Ford1 Fords great strength was the manufacturing process一not invention.Long before he started ...
- 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 Batteries Built by VirusesWhat do chicken pox,the common cold,the flu,and AIDS have in common?...
- 共用题干 第三篇Trying to Find a PartnerOne of the most striking findings of a recent poll in the UK is tha...
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...