单项选择题
A.5% B.3% C.10% D.20% E.80%
A.7%～10% B.3%～5% C.14%～18% D.12%～16% E.20%左右
A.96% B.92% C.90% D.93% E.95%
A.11% B.90% C.12% D.80% E.15%
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