单项选择题
A.15 B.10 C.2 D.1[T/]
A.1 B.1.2 C.1.5 D.2[T/]
A.99.5 B.99.9 C.99.0 D.98.5[T/]
A.1 B.2 C.3 D.4[T/]
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