单项选择题
A.4.2% B.3.2% C.5.3% D.3.6% E.3.4%
A.51.9%~66.0% B.50.8%~67.2% C.49.2%~68.8% D.48.6%~69.4% E.52.3%~65.6%
A.18.4 B.21.5 C.23.7 D.25.4 E.40.6