b.Diluting wastes needs certain amount of water
c.Demands for water will go up along with the expanding population
d.Intensive cultivation of land requires more and more chemicals
3.The reader can conclued that________.
a.countries of the world will work together on polution 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 ,aking economic use of wastes
4.The author gives substance to the passage through the use of _______.
a.interviews with authorities in the field of water controls
b.opinions and personal observations
c.definitions which clarify important terms
d.strong arguments and persuasions
5.The words prior to probably mean______.
a.after
b.during
c.before
d.beyond
答案:cadbc
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