判断题
A.10 B.20 C.30 D.40
A.4 B.5 C.6 D.7
A.10% B.20% C.30% D.40%
A.30% B.50% C.60% D.80%
A.20 B.30 C.40 D.50
A.10 B.20 C.30 D.40