单项选择题
A.5 B.10 C.15 D.20
A.1~1.5 B.1.5~2.0 C.1.8~2.5 D.2.0~2.7
A.4 B.5 C.6 D.7
A.1.5~1.8 B.1.8~2.1 C.2.1~2.4 D.2.4~2.7
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