单项选择题
A.2.1 B.2.2 C.2.3 D.2.4
A.0.5 B.1 C.1.5 D.2
A.0.35 B.0.3 C.0.2 D.0.25
A.1-5-3-6-2-4 B.1-3-5-2-4-6 C.1-6-5-3-2-4 D.1-4-3-6-2-5
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