单项选择题
A.8:35 B.8:30 C.8:25 D.8:20 E.8:15
A.270,230 B.280,240 C.370,330 D.380,340 E.470,430
A.450,900 B.500,1000 C.550,1100 D.600,1200 E.650,1300