单项选择题
A.1:70 B.1:50 C.1:30 D.1:20
A.1:200 B.1:150 C.1:100 D.1:50
A.1:500 B.1:400 C.1:300 D.1:200
A.1:2000 B.1:1000 C.1:500 D.1:300
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