![Overheadbridgesarefoundinmanypartsofbigcities,especiall...]( "Overheadbridgesarefoundinmanypartsofbigcities,especiall...")
- 问题详情：Overheadbridgesarefoundinmanypartsofbigcities,especiallyinplaces___46___trafficisveryheavyandcrossingtheroadisdangerous.Thepurposeofthesebridges___47___(be)toenablepedestrianstocrossroads___48___(safe).Overheadbridgesareusedinverymuchthe___49...
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