单项选择题
A.10 B.30 C.50 D.80
A.1/2~1/3 B.1/4~1/5 C.1/6~1/7 D.1/8~1/9
A.3~2 B.5~4 C.7~6 D.9~8
A.70 B.80 C.90 D.95
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