根据短文理解，完成下了任务。

    My name is Alice. I'm 13. I like sports very much. I have a basketball and a football at home. They are under my desk. I often(经常)play balls with my friends. I like vegetables. I often have tomatoes and carrots for lunch. I like ice-cream, too. My parents are doctors. They like watching soccer games on TV.

回答下列问题：

读图“某旅友暑期期间自行车骑行途经地点的手机截屏图”，完成下列各题。

中国粮食生产年增长率从1957-1978年间的2.1%提高到1979-1984年间的4.9%。粮食生产年增长率提高的主要原因是（   ）
①《中华人民共和国土地改革法》的颁布 ②农业生产合作社的成立  ③杂交水稻技术的不断提高  ④家庭联产承包责任制的实行