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【单选题】
世界上最富裕的国家(如日本和德国)的人均收入是世界上最穷的国家(如巴基斯坦和印度)的()倍A.
3
B.
6
C.
12
D.
36
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A.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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A.
causal reasoning
B.
various types of reasoning
C.
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D.
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A.
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B.
定量分析
C.
成本分析
D.
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