单项选择题
A.3:2 B.4:3 C.5:4 D.7:6
A.12 B.14 C.15 D.16
A.16:00 B.16:30 C.17:00 D.17:30
A.200 B.150 C.100 D.50
A.1.5 B.2 C.2.5 D.3
A.5 B.5.5 C.6 D.6.5
A.120米 B.122.5米 C.240米 D.245米
A.10 B.12 C.12.5 D.15
A.975 B.1020 C.1065 D.1155
A.46次 B.47次 C.48次 D.49次
A.489 B.400 C.498 D.513