The reader can conclude that___________.

2023-05-26

A.countries of the world will work together on pollution problems
B.byproducts from wastes lead to a more prosperous marketplace
C.science is making great progress on increasing water supplies
D.some industries are now making economic use of wastes

参考答案:D

文章最后一段讲了第二种措施,即to develop an economic use ofthe wastes。倒数第二句“Many industries…are currently converting former waste production into marketable byproducts”说明一些行业已经在利用废物获得经济利益。所以选D。