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- 共用题干 New Product Will Save livesDrinking water that looks clean may still contain bugs（虫子）,which ca...
- 共用题干 Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exete...
- 共用题干 Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the s...
- 共用题干 第一篇How Animals Keep WarmMan has invented ways to keep warm,but how do animals defend themselve...
- 共用题干 A Star Is Born1 The VLT (Very Large Telescope) is the worlds largest telescope（望远镜）and is taki...
- 共用题干 The Difference between Man and ComputerWhat makes people different from computer programs?What...
- We should not sacrifice environmental protections to foster economic growth.
- 共用题干 EarthquakeHow does an earthquake start?What makes an earthquake happen? The rock of the earths...
- 共用题干 第一篇Pushbike DangerLow speed bicycle crashes can badly injure一or even kill一children if they fal...
- 共用题干 New Product Will Save livesDrinking water that looks clean may still contain bugs（虫子）,which ca...