单选题
The reader can conclude that______.
A、
countries of the world will work together on pollution problems
B、
some industries are now making economic use of liquid wastes
C、
by-products from wastes lead to a more prosperous marketplace
D、
science is making great progress in increasing water supplies
【正确答案】
B
【答案解析】
第三段最后两句均阐述某些正在从经济上利用废水。
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