单项选择题
A.10 B.15 C.20 D.25
A.3%/5%/1%/1% B.5%/1%/3%/1% C.3%/1%/5%/1% D.5%/3%/1%/1%
A.80 B.85 C.88 D.90
A.13 B.12 C.11 D.10
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