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- 共用题干 When We Are AsleepEveryone dreams,but some people never recall their dreams,or do so very rare...
- Many economists have given in to the fatal lure of mathematics.
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- Baby Talk Babies normally start to talk when they are 13 to 15 months old. Ryan Jones is only ...
- 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 Animals “Sixth Sense”A tsunami（海啸）was triggered（引发）by an earthquake in the Indian Ocean in Dec...
- 共用题干 Read With Greater SpeedDo you have difficulty reading in class?If so,a special reading program...
- 共用题干 第二篇Where Have All the Frogs Gone?In the 1980s,scientists around the world began to notice some...
- 共用题干 Batteries Built by VirusesWhat do chicken pox,the common cold,the flu,and AIDS have in common?...