look at this picture .At the top and of the river,a chemical factory and ……帮忙找一下这篇缺词填空look at this picture .At the top and of the river,a chemical factory and paper-making factory are sending out many poisonous waste

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look at this picture .At the top and of the river,a chemical factory and ……帮忙找一下这篇缺词填空
look at this picture .At the top and of the river,a chemical factory and paper-making factory are sending out many poisonous waste

在and of the river的and和of之间加上downstream(下游),整句话就通顺了.
看这幅图,在这条河流的源头和下游,一个化工厂和一个造纸厂正在排放很多有毒废物.