A.500 B.750 C.900 D.1000
A.60000 B.50000 C.30000 D.40000
A.30 B.40 C.50 D.60
A.大于4倍 B.大于5倍 C.大于2倍 D.大于3倍
A.小于50 B.小于100 C.小于150 D.小于200
A.85% B.80% C.90% D.75%