![Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods....]( "Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods....")
- 问题详情：Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods.LiBing,togetherwithhisson,decidedtoconstructanirrigationsystemontheMinjiangRiver____41____ (prevent)flooding. ___42___havingalongstudyandalotofhardworkbythelocalpeople,thegreatDujiangya...
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