3 地球上淡水占總貯水量的比例是:
(A)2.23%
(B)2.33%
(C)2.43%
(D)2.53%
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統計: A(0), B(1), C(0), D(0), E(0) #913601
統計: A(0), B(1), C(0), D(0), E(0) #913601