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				 Usually it cannot because the outside of the earth is too thick and strong. But in some places the outside of the earth is      and weak.    A. thin       B. thick        C. flat       D. water			【查看更多】
			


		
           
          


		
          
		
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          Usually it cannot (get out) because the outside of the earth is too thick and strong. But in some places the outside of the earth is ____ and weak.
               A. thin     B. thick      C. flat     D. water
           
           
          

			
          
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