单选

(      )30. In order to solve the problem of water shortage,we' have to________.

  • a. make use of sea water on the earth
  • b. save as much fresh water as possible
  • c. reuse the water from large cities
  • d. stop people from,using water
  • e. only use the 3% of the water on the earth
  • A.a and e   
  • B.a,b and c   
  • C.b,c and d   
  • D.a,b and d
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