题目

Walt Disney was born in America. When he was very young, his family moved from the city to a farm.When Disney was in high school, although he was busy most of the time, he could still find time to do things he liked. He spent much of his free time drawing pictures of the animals on the farm. He then began to make up stories about them. Later, he even began taking art classes on Saturdays.After he finished college, he became a newspaper artist. As he grew older, Disney’s art talent also grew. He began using a new way to tell his stories. To do this, he drew the same picture over and over agai下图为人口基数相等的四城市某年人口变动资料，据图回答下列问题。1.这四个城市人口自然增长率按由低到高顺序排列正确的是（ ）A．①③②④ B．②④①③ C．③④②① D．②③①④2.四个城市中人口机械增长最多的是（ ）A．① B．② C．③ D．④3.20世纪80年代以来，影响我国人口迁移的主要因素是A．交通 B．生态环境 C．经济 D．社会文化4.本世纪初中国的人口数量（a表示）、中国的人口合理容量（b）、中国的环境人口容量（c）三者的关系正确是：A．a<b<c B．c<b<a C．b<a<c D．a<c<b