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- 共用题干 Cloning（克隆）:Future Pertect?1 A clone is an exact copy of a plant or animal produced from any ...
- 共用题干 DVD for Rent1.A pay-for-play system for video DVD will emerge by summer as an alternative,a...
- 共用题干 第三篇The Exploding Lakes of CameroonWhat comes to mind when you think of a lake?You probably ima...
- 共用题干 Solar StormAt the end of October 2003,a sudden solar storm hit the earth.A solar storm refers...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 Motion SicknessLiving in space looks like lots of fun.You can do certain things in space(like ...
- 共用题干 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...
- 共用题干 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 The Difference between Man and ComputerWhat makes people different from computer programs?What...