单项选择题
A.5% B.10% C.15% D.20%
A.1/3～2/3 B.1/3～1/2 C.2/3～3/4 D.3/4～4/5
A.20 B.30 C.40 D.50
A.50%～60% B.60%～70% C.70%～80% D.80%～90%
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