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- 共用题干 Energy and Public LandsThe United States boasts substantial energy resources. Federal lands pr...
- 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Okla...
- Hearing problems may be alleviated by changes in diet and exercise habits.
- 共用题干 The Value of MotherhoodIn shopping malls,the assistants try to push you into buying“a gift to ...
- 共用题干 The iPad1 The iPad is a tablet computer（平板电脑）designed and developed by Apple. It is par-ticula...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- 共用题干 The Greatest Mystery Of WhalesThe whale is a warm-blooded,air-breathing animal,giving birth to...
- 共用题干 Travel Across AfricaFor six hours we shot through the barren（荒芜的）landscape of the Karoo desert...
- The walls are made of hollow concrete blocks.