判断题
A.1/5 B.1/4 C.1/2
A.5 B.10 C.15
A.2 B.3 C.4
A.1000 B.1100 C.1200
A.60 B.65 C.70 D.75
A.3 B.4 C.5 D.6
A.20 B.25 C.30 D.35
A.2 B.3 C.4 D.5