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- 共用题干 第一篇Renewable Energy SourcesToday petroleum（石油）provides around 40% of the worlds energy needs, ...
- 共用题干 High-Tech Warfare（战争）Today,high-tech warfare is no longer an abstract concept,but a real issue...
- The news will horrify everyone.
- These are defensive behavior patterns which derive from our fears.
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 Travel Across AfricaFor six hours we shot through the barren（荒芜的）landscape of the Karoo desert...
- 共用题干 第一篇Almost Human?Scientists are racing to build the worlds first thinking robot.This is not sci...
- 共用题干 The Value of MotherhoodIn shopping malls,the assistants try to push you into buying“a gift to ...
- 共用题干 A Heroic WomanThe whole of the United States cheered its latest hero,Ashley Smith,with the Fed...
- 共用题干 Cloning（克隆）:Future Perlect?1 A clone is an exact copy of a plant or animal produced from any o...