Overheadbridgesarefoundinmanypartsofbigcities,especiall...
問題詳情:Overheadbridgesarefoundinmanypartsofbigcities,especiallyinplaces___46___trafficisveryheavyandcrossingtheroadisdangerous.Thepurposeofthesebridges___47___(be)toenablepedestrianstocrossroads___48...