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- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 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 A Star Is Born1 The VLT (Very Large Telescope) is the worlds largest telescope（望远镜）and is taki...
- 共用题干 AnimalsSixth SenseA tsunami（海啸）was triggered（引发）by an earthquake in the Indian Ocean in Decemb...
- 共用题干 The Joy of Living AloneMore and more Americans are living alone.Some live alone because of div...
- 共用题干 The Difference between Man and ComputerWhat makes people different from computer programs?What...
- 共用题干 A Doctor in the HouseBrushing your teeth twice a day should keep the dentist away. But if a gr...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 Ants Have Big Impact on Environment as“Ecosystem Engineers”Research by the University of Exete...
- 共用题干 “Liquefaction” Key to Much of Japanese Earthquake DamageThe massive subduction zone earthquake...