单项选择题
A.20 B.50 C.100 D.200 E.500
A.25 B.28 C.30 D.32 E.35
A.8.13～8.55 B.10. 13～10.55 C.12.13-12.55 D.15.13～15.55 E.18.13～18.55
A.21% B.20% C.19% D.18% E.17%
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