My family is very poor,so we have to live in a small _______

My family is very poor,so we have to live in a small ________.A.house B.building C.space room
D.apartment

My family is very poor,so we have to live in a small apartment
再问： 为什么？
再答： house 大房子 building建筑物 space是指空间，比较抽象 room是指房间 apartment公寓
再问： 为什么不是building？
再答： building主要指建筑物、大厦，如果用于居住，指一栋楼，或一单元比较多。