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【单选题】
我国总体上是一个资源紧缺的国家，其中人均水资源占有量仅相当于世界人均占有量的（），全国有400多个城市供水不足，矿产资源人均占有量只有世界平均水平的（），石油储量仅占世界的2.3%。A.
1/4；1/2
B.
1/2；1/4
C.
1/2；1/2
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举一反三
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B.
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C.
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D.
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