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Practice Reading: Reading Fill in the Blanks ID: #50598 Quake-resistant Structures
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In  the  past,  making  structures  quake-resistant  meant  firm  yet    materials,  such  as  steel  and  wood,  that  bend  without  breaking.  Later,  people  tried  to  lift  a  building  off  its  foundation,  and  insert  rubber  and  steel  between  the  building  and  its  foundation  to    the  impact  of  ground  vibrations.  The  most    designs  give  buildings  brains  as  well  as  concrete  and  steel  supports,  called  smart  buildings,  the  structures  respond  like  living  organisms  to  an  earthquake's  vibrations.  When  ground  shakes  and  the  building  tips  forward,  the  computer  would    the  building  to  shift  in  the  opposite  direction.  The  new  designs  should  offer  even  greater    to  cities  where  earthquakes  often  take  place.

force resistant expensive flexible security reduce recent opposed

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