单项选择题
A.一天 B.半天 C.1/2 D.1/3
A.1/3 B.1/4 C.1/2 D.1/5
A.1/4 B.1/3 C.1/5 D.1/2
A.3-4 B.2-3 C.3-5 D.2-5
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