单项选择题
A.20亿B.30亿C.14亿D.9亿
A.907.97亿;4813.27万B.908.97亿;4823.27万C.909.97亿;4883.27万D.906.97亿;4863.27万
A.75.93岁B.77.93岁C.72.93岁D.75岁