阅读理解。根据短文内容，选择正确答案。

    The story is about two mice. They are friends. One mouse lives in the country. The other lives in the city. One day they meet each other. The one in the country says, “Come and have look at my house.” They come to a house in a field. The country mouse gives the city mouse nice food. But the city mouse says. “This food is not good. You must come and live with me inthe city.”

    So they go to the house of the city mouse. It is a very good house. Nice food is ready (准备）for them to eat. But just when they begin to eat, they hear a great noise. “Run! Run! The cat is coming!” the two friends run away quickly. After some time, they go out. The country mouse says to the city mouse, “I don't like to live in the city. It's dangerous.”

①增强了国民经济活力，充分调动社会各方面的积极性   ②对加快生产力发展和扩大就业具有重要作用

③对巩固和发展公有制经济具有重要意义   ④是实现人民共同富裕的重要保障