单项选择题
A.0.3 B.0.4 C.0.45 D.0.5
A.0.2 B.0.3 C.0.4 D.0.5
A.0.8 B.0.9 C.1 D.1.1
A.0.4 B.0.3 C.0.6 D.0.5
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