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- 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 The Greatest Mystery Of WhalesThe whale is a warm-blooded,air-breathing animal,giving birth to...
- 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 Batteries Built by VirusesWhat do chicken pox,the common cold,the flu,and AIDS have in common?...
- 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 The FamilyThe structure of a family takes different forms around the world and even in the sam...
- 共用题干 “Liquefaction” Key to Much of Japanese Earthquake DamageThe massive subduction zone earthquake...
- 共用题干 Earths Inner CoreScientists have long struggled to understand what lies at the planets center....
- 共用题干 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...