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- 共用题干 第三篇The Science of the FutureUntil recently,thescience of the futurewas supposed to be electron...
- 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 Robots May Allow Surgery in SpaceSmall robots designed by University of Nebraska researchers m...
- 共用题干 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....
- 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 Teaching Math,Teaching AnxietyIn a new study about the way kids learn math in elementary schoo...
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- 共用题干 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....
- 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 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....