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- A lot of people could fall ill after drinking contaminated water.
- 共用题干 Thirst for OilWorldwide every day,we devour the energy equivalent of about 200 million barrels...
- 共用题干 Solar StormAt the end of October 2003,a sudden solar storm hit the earth.A solar storm refers...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...
- 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 Wide World of RobotsEngineers who build and program robots have fascinating jobs. These resear...
- Our aim was to update the health service,and we succeeded.
- 共用题干 The Greatest Mystery Of WhalesThe whale is a warm-blooded,air-breathing animal,giving birth to...
- 共用题干 Robots May Allow Surgery in SpaceSmall robots designed by University of Nebraska researchers m...