单项选择题
A.1/2 B.15/16 C.5/16 D.1/3
A.0.62 B.0.72 C.0.82 D.0.92
A.1/2 B.1/4 C.1/8 D.1/16
A.1/6 B.1/7 C.0 D.6/7
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