48 According to the passage, which of the following is NOT discussed in the project?
(A) The sources of drinking water
(B) The treatment of drinking water
(C) The price of drinking water
(D) The distribution of drinking water
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統計: A(12), B(26), C(220), D(13), E(0) #1329156
統計: A(12), B(26), C(220), D(13), E(0) #1329156