单项选择题
A.0.7~0.8B.0.8~0.9C.0.9~1.0D.1.0~1.1
A.2~3B.3~4C.4~5D.5~6
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
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