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- Techniques to employ the energy of the sun are being developed.
- 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 Cloning（克隆）:Future Pertect?1 A clone is an exact copy of a plant or animal produced from any ...
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 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 第一篇Trying to Find a PartnerOne of the most striking findings of a recent pol!in the UK is that...
- 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 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...