如图，在△ABC中，AB＝AC＝20cm，DE垂直平分AB，垂足为E，交AC于D，若△DBC的周长为35cm，则BC的长为（         ）
 

阅读下面短文，从A、B、C、D四个选项中选出最佳选项。

    The government in China ended his one-child policy and let families have two children instead in 2015.

    A Chinese Communist Party statement gave a number of reasons for the change in policy. The statement said the change is meant to balance population development, stop a falling birth rate(出生率)and strengthen the country's labor force(劳动力). China, with the largest population in the world, started the one-child policy in 1980. But the government allowed only a small number of couples to have two children. For example, some families in the countryside could have two children, if the first-born is a girl.

    In 2013, the Chinese government gave other couples a chance to have two children if one of them was an only child.

Jiang Quanbao, a teacher and population expert, explained how Chinese families react(反应) to the newest policy. "Too many young people in the cities are no longer interested in having a second child," he said. "People in the countryside are more interested. But some of them are already allowed to have two children." At the end of 2014, China had a population of 1.37 billion people. A total of 800 million of them have jobs. But the labor market need of labor by the year 2050. With the two-child policy, an increase in births can solve this problem.

    Boys and girls, what do you think of the two-child policy? Do you want to have a new-born brother or sister?

小红经常轻易向别人承诺，可有时办不到，这时你会用《老子》中的警句劝告她：____。

你的同桌喜欢读冰心奶奶的作品，你想劝他广泛阅读，博览群书，你会说：只看一个人的____，结果是不大好的：你就得不到多方面的优点。必须如蜜蜂一样，采过许多花，这才能____蜜来。倘若叮在一处，所得就非常有限，枯燥了。我今天放学固家，还没放下书包就被妈妈训了一顿，真叫我：丈二和尚——____。