根据贮存物品的火灾危险性，煤油、硝酸、氧气属于哪类贮存物品（）
A.甲类
B.乙类
C.丙类
D.丁类
参考答案：B
The doctor cured a lot of patients free of charge, so he had a good ________. [ ]
A. evolution
B. occupation
C. reputation
D. revolution
甲乙两数的比是3：2，甲数是乙数的______乙数是甲乙两数和的______．
