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- 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 Female BullfightingIt was a unique,eye-catching sight:an attractive woman in a shiny bullfight...
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 第二十二篇 RealWld Robots When you think of a robot, do you envision ashiny, metallic device having th...
- 共用题干 The Smog（烟雾）For over a month,Indonesia was in crisis.Forest fires raged out of control as the ...
- 共用题干 Free Statins with Fast Food could Neutralize Heart RiskFast food outlets could provide statin ...
- 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 Batteries Built by VirusesWhat do chicken pox,the common cold,the flu,and AIDS have in common?...
- As a politician,he knows how to manipulate public opinion.