我国南北朝数学家何承天发明的“调日法”是程序化寻求精确分数来表示数值的算法，其理论依据是：设实数x的不足近似值和过剩近似值分别为 $\frac{b}{a}$ 和 $\frac{d}{c}$ （a，b，c，d∈N^*），则 $\frac{b+d}{a+c}$ 是x的更为精确的不足近似值或过剩近似值．我们知道π=3.14159…，若令 $\frac{31}{10}$ ＜π＜ $\frac{49}{15}$ ，则第一次用“调日法”后得 $\frac{16}{5}$ 是π的更为精确的过剩近似值，即 $\frac{31}{10}$ ＜π＜ $\frac{16}{5}$ ，若每次都取最简分数，那么第四次用“调日法”后可得π的近似分数为（  ）

根据汉语提示完成句子

       Dolores Huerta has worked hard most of her life to help other people. She has helped change things so that farm workers can have a better life.
      Dolores grew up in California. She was a good student and liked school. After she finished high school, she went to college and studied to be a teacher. After she became a teacher, Dolores noticed that many of her students were not getting enough food to eat. Some of them wore very old clothes. Dolores wondered how she could help them.
        Dolores decided to stop teaching so that she could spend more time helping the farm workers and their families. One thing she wanted to do was to get more pay for farm workers so they could buy their children the things they needed.
Dolores knew that many farm workers moved often from one place to another to help pick different kinds of fruits and vegetables. She began talking and writing about these workers. Even people who lived far from California read what Dolores wrote.
      Getting higher pay for the farm workers was not easy. Dolores worked hard to make sure that farm workers got good pay for their work. She knew that nothing would change unless people made new laws to help the workers. Through all her hard work, new laws were made that gave farm workers good pay.
     Dolores Huerta has worked for more than 30 years in many different ways to make life better for working people. She has shown how much one person can change things.

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