单项选择题
A.1/5 B.1/4 C.1/3 D.1/2
A.3 B.4 C.5 D.6
A.1 B.2 C.3 D.4
A.0.6~0.7 B.0.7~0.8 C.0.8~0.85 D.0.85~0.9
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