①土地改革后,农民耕种“自己的地” ②农业社会主义改造后,农民耕种“公家的地”
③家庭联产承包责任制后,土地归农民个人所有 ④三次变革都促进了农业生产的发展
A:①②④
B:②③④
C:①②③
D:①③④
——Is your father in?
——No, he ______ for three hours.
用简便方法计算.
513×17+813÷7
It there anyone in your class ______ family is in the country?