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- 共用题干 Thirst for OilWorldwide every day,we devour the energy equivalent of about 200 million barrels...
- 共用题干 More Than 8 Hours Sleep Too Much of a Good Thing1 Although the dangers of too little sleep are...
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...
- 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...
- It is the movement,not the color,of objects that excites the bull.
- 共用题干 U. S. Scientists Confirm Water on MarsNASA scientists said that Mars was covered once by vast ...
- 共用题干 Migrant（移民的）WorkersIn the past twenty years,there has been an increasing tendency for workers ...
- Since ancient times people have found various ways to preservemeat.
- 共用题干 The FamilyThe structure of a family takes different forms around the world and even in the sam...