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- 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 Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that ...
- 共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...
- He kept in contact with his family while he was in Australia.
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- Anderson left the table,remarking that he had some work to do.
- 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 An Intelligent CarDriving needs sharp eyes, keen ears, quick brain, and coordination（协调）betwee...
- 共用题干 The Joy of Living AloneMore and more Americans are living alone.Some live alone because of div...