单项选择题
A.12 B.12.3 C.12.5 D.12.6
A.27.29 B.27.39 C.27.49 D.27.59
A.23.29 B.23.39 C.23.49 D.23.59
A.18.88 B.18.99 C.19.88 D.19.99
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