A:大庆油田、辽河油田
B:吉林油田、华北油田
C:辽河油田、胜利油田
D:中原油田、大庆油田
——All the teachers went on a trip to Hainan yesterday Mr. White. Why?——Because he was too busy a new novel to travel.
Three million _______ a large number. You can make it _______.