单项选择题
A.2/5 B.3/5 C.2/3 D.1/3
A.0.26 B.0.61 C.0.87 D.0.13
A.2/3 B.1/2 C.1/3 D.1/8
A.0.3 B.0.5 C.0.8 D.0.7
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