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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 第二篇Superconducting Ceramic（陶瓷）An underaround revolution beqins this winter. With the flip（轻击）o...
- 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 第一篇Is the Tie a Necessity?Ties,or neckties,have been a symbol of politeness and elegance in Br...
- 共用题干 第一篇Is the Tie a Necessity?Ties,or neckties,have been a symbol of politeness and elegance in Br...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 共用题干 第二篇A Phone That Knows Youre BusyIts a modern problem : youre too busy to be disturbed by inces...
- You have to be patient if you want to sustain your position.
- 共用题干 A Doctor in the HouseBrushing your teeth twice a day should keep the dentist away. But if a gr...