来自刘纯武的问题
Asweallknow,waterpollutionisbecomingmoreandmoreserious.Somefactoriespouringinthewaterintotherivers.Asaresult,itmakesthewaterdirtyandsmellterrible.Mostoffishinthewaterhavedeadandwecan'tswiminthewater.Waterisv
Asweallknow,waterpollutionisbecomingmoreandmoreserious.Somefactoriespouringinthewaterintotherivers.Asaresult,itmakesthewaterdirtyandsmellterrible.Mostoffishinthewaterhavedeadandwecan'tswiminthewater.Waterisvery___tohumanbeings,soweshoulddoourbesttoproectandsaveit.
