题目

下列选项中不是乡村人口迁往城市的原因的是（ ）A． 经济水平提高，乡村有剩余劳动力B． 人口增长太快，乡村居住不下C． 城里有更多更好的发展机会D． 城里教育、医疗、生活条件好 答案：B．—Mr Wang ,there are so many new words in this conversation.Can you help me?--Oh,don’t worry.You can __ _in the dictionary.A.look up them B.look them upC.look it up D.look up it