单项选择题
A.1/2 B.1/3 C.1/4 D.2/5
A.1/3,1/4 B.1/3,1/2 C.1/2,1/4 D.1/3,2/5
A.7 B.10 C.12 D.24
A.甲 B.乙 C.三 D.四
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