单项选择题
A.1.1~1.2B.1.2~1.3C.1.3~1.4D.1.4~1.5
A.20~30B.25~35C.30~40D.35~45
A.5~15B.10~20C.15~25D.20~30
A.0.5~1B.1~1.5C.1.5~2D.2~2.5
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