下列措施中，实现了把生产资料私有制转变为社会主义公有制的是（    ）

已知x=1是一元二次方程x²+ax+b=0的一个根，则代数式a²+b²+2ab的值是____ 

____

选词填空阅读下面短文，从方框中选择单词，根据实际情况用其适当形式填空，使短文意思完整、通顺。每空一词，每词只能用一次。

 A man was tired of living in his small house in the country.  He wanted to sell it and buy a ____  one than the old one nearby. He tried to sell it for a long time, but____ wanted to buy it. So at last, he decided to use a house salesman. The salesman soon put a picture of the man's house on a magazine. ____  days later, the owner saw a very beautiful picture of the house, with a wonderful introduction to its gardens, on a magazine. After the house owner had read ____ the whole introduction, he at once called up the salesman and said,“I'm sorry, but I've decided not to sell this house after all. After ____  your introduction, now I know that It's just the kind of house I'm going to live in for the rest of my life.