我国是一个农业大国，农业、农村、农民问题的解决，关系到人民的切身利益、社会的安定和整个国民经济的发展。党和国家历来十分重视“三农”问题，在不同时期采取了不同的土地政策，对生产关系进行调整。结合所学知识，回答下列问题：

材料一：

材料二：安徽省凤阳县小岗村1976年与1979年收入对比表

    When I was waiting for a bus at a station, I saw a young man get into a telephone box near the station. After a short time, he came out and____ very sad (难过的). As he saw me, he came over.

    "Good afternoon, sir," he said. "____ was Abraham Lincoln born, do you know?"

    I felt a little ____ at his words. "Something may be wrong (有毛病的) with him," I thought. Then he asked ____ and I could see that he was not joking (开玩笑). So I thought for a minute and ____ him that Abraham Lincoln was born in 1809.

    The young man thanked ____  turned around and walked into the telephone box again. A few minutes later, he came out ____. He thanked me again and told me that he wanted to make a telephone call to his friend but he ____ his telephone number.

    "You ____ me remember it," he said. "His telephone number is '180909', and you can remember it easily ____ you know when the great man was born."

如图为肾脏内部结构示意图，请根据图回答问题．