单项选择题
A.2.4~2.9 B.2.9~3.2 C.3.2~3.5
A.0.2-0.3 B.0.5-0.6 C.0.4-0.5 D.0.2-0.5
A.65 B.70 C.75
A.85 B.95 C.105
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