China has the largest population in the world. In order to control the population, China________the one-child policy in 1979. And it made great success.________, as the time went by, many people saw not only its advantages but also disadvantages. So in 2016, our government started a new policy—the two-child policy. Many people believed that if one couple(夫妻) had two children, the children could________the burden(负担) of looking after their parents.

In modern society, we face a big problem of an aging population. To________this problem, the Chinese government decides to carry out a three-child policy in June 2021. It________one couple to have three children. The new policy marks the________of the two-child policy. Experts hope the new policy can change the________of a falling population. However, many couples would like to have a second child, they________have a third one. They’re worried about the high cost of a third child and they don’t want to spend too much time________a new baby, although the government promises to take some measures to________the couples to raise three children. What will the new policy bring to the society is still on the way.

Robert Swan wanted to be an adventurer (冒险家) when he was 11. He wanted to become the first person to walk to both the North Pole and the South Pole (南极和北极). People told him he was crazy, but he never gave up his dream.

In January 1986, Swan and his team reached the South Pole for the first time. Just three years later, Swan created a new team to head for the North Pole.

During those two long trips, Swan noticed some terrible things. At the South Pole, the color of his eyes changed because of a kind of rays. This kind of rays are harmful to both humans and the environment. At the North Pole, the ice started to melt (融化) four months earlier than the usual “melt season”. These two things made Swan realize the poles were in danger. He thought he must do something.

Now he works to help people pay more attention to the environment protection, especially the poles. Swan hopes that he can not only save the two amazing places, but also help protect humans’ health. Because protecting the nature is protecting ourselves.

Do you know which social app is popular with Chinese young people now? “Short videos” are certainly the most popular. A large number of young people use Tik Tok(抖音) and Kuaishou. They think it is fun to share their lives by short videos, while others have other purposes as well.

A 12-year-old user named Elsa has about 2.7 million fans on Tik Tok. The girl has shared her dancing studies on Tik Tok since last July. One of the videos won her about one million fans. “I feel really glad to share happiness with people by short videos,” said Elsa.

To some other young people, they use short videos to have a quick look at the hot programs. “Because I don’t like to spend many hours watching a whole program, I hate waiting for a program to end, and I prefer to watch short videos of wonderful parts of hot programs,” said Wang Zhihao.

However, some young people feel bored with short videos. “Killing time is the main reason for me to watch short videos, and many short videos are almost the same, so I think they are not so useful or interesting. What’s more, I really don’t like the videos about strange and dangerous things,” said Wen Nan, another college student.

Recently, something else has appeared. Some videos are telling people what commodities are worth buying. Some short videos even sell bad commodities, and it’s hard for customers to get their money back. So we should think twice before we want to buy the commodities by short videos.

There used to be a forest near our town. But people around it cut down trees every year until one year, there were no trees left.

    46     While eating and drinking, we talked about the missing forest. One of my classmates told us his thoughts about the change. “    47     My family always tell me that we should value the land and we can’t do anything harmful to it when we make use of it. Otherwise, we may leave nothing to the later generations (一代人).”     48     “Yes. We all know that forest is very important to the human. It benefits humans in many different ways. We can’t imagine how terrible the earth will be if we have no forest,” said our teacher after a moment.     49     some classmates advised. We all agreed. During the following days, we worked hard and planted hundreds of trees.

That was years ago. Today, when I stand here again, I find a new forest. The trees are as tall as I am.     50     It also brings a new hope to the town. It taught us the power of thinking about the future.

71. 假如你是李华，是一名学生。为大力推进生态文明建设，你所在的城市正开展以“绿色生活，美丽家园”为主题的宣传月活动。请你根据以下提示以“共建美丽家园”为主题，写一篇英语演讲稿，呼吁大家爱护环境、保护生态，建设美丽家园。