阅读短文，下列问题

 B

    My grandfather is an eighty-year-old man. He always complains about how fast things have changed, and he often says that life used to be better.

    Families aren't families the way they used to be. A lot of families have broken down. If husband and wife have problems with their marriage, they no longer stay together. And mothers used to stay at home and take care of their children, but now everyone is working. No one has time to look after children at home.

    And the cars! Most families have a car now. We used to walk five miles to school every day, even in winter. But now children don't. And in school, the children don't have to think anymore. In math class，for example, we used to add, subtract （减）, multiply （乘） and divide （除） in our heads. Kids don't use their heads anymore; instead, they use calculators （计算器）.

    Most families have computers now. In the past, we didn't have computers. We didn't even have lights. My mother used to spend all day cooking in the kitchen. But now fewer and fewer people eat home-cooked food.

    And people don't talk to each other anymore. They are too busy to talk, too busy to eat, too busy to think...

    Life used to be simple, but it isn't anymore.