单选题 0分

72 . Our increasing population will tremendously increase urban wastes,primarily sewage. 73 ...

72 . Our increasing population will tremendously increase urban wastes,primarily sewage. 73 Rapidly expanding industries which involve more and more complex chemical processes will produce larger volumes of liquid wastes, 74 . To feed our rapidly expanding population, 75 . This will involve ever-increasing quantities of agricultural chemicals.
  • A. agriculture will have to be 68
  • B. Water problems 69 will become more intense and more complex
  • C. On the other hand, increasing 70 for water will decrease substantially the amount of water available for diluting wastes
  • D. and many of these will contain chemicals which are 71

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