单项选择题
A.1.39 B.1.59 C.1.79 D.1.99
A.2.22 B.3.33 C.4.44 D.5.55
A.4.3%～46% B.5.3%～45% C.6.3%～47% D.7.3%～44%
A.1.09 B.1.19 C.1.29 D.1.39
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