47 According to the passage, where in the world is the problem of clean water supply most serious?
(A) The developed world
(B) The underdeveloped world
(C) The natural world
(D) The developing world
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統計: A(30), B(38), C(17), D(182), E(0) #1329155
統計: A(30), B(38), C(17), D(182), E(0) #1329155