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- 共用题干 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...
- 共用题干 Narrow EscapeWe had left the hut too late that morning. When we stepped outside,the sky beyond...
- 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 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 High-Tech Warfare（战争）Today,high-tech warfare is no longer an abstract concept,but a real issue...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- The study also notes a steady decline in the number of college students taking science courses.