Kevin is a special swimmer. He took risks to ______ in very cold places because he wanted people to pay attention to environmental problems.

As a boy, Kevin visited national parks and he learned the Earth is in ______ condition. He felt worried, and he wanted to ______ the Earth. In 2009, he went to swim in water near North Pole（北极）to draw people’s attention to the melting glaciers（融化的冰川）. Kevin said that the swim was so painful that it would be his ______ time swimming in cold water. In 2016, he heard about a lake in the Himalayas（喜马拉雅山脉）. It was formed by melting glaciers. He ______ to swim in cold water again. It was difficult to swim in the lake. The air was so ______ that it was hard to breathe. He told people about his experiences on TV. He wanted people to know that glaciers in the Himalayas are disappearing ______ global（全球的）warming and that there’s less water for people in nearby ______ like China, India, and Pakistan.

From Kevin’s story, we learn two ______ . We learn that people can do a lot of harm to the Earth without realizing it. Also, we learn that if we ______ the way we think, we can do something to protect our environment. With the new way of thinking in our minds, we can enjoy a bright future.

Recently, China has announced the list of the first five national parks.

Each of them is divided into two parts—the core (核心) protection area and the general control area. In the core protection area, only research and surveillance (监视) in science are allowed. And the general control area is open to the public, allowing travel activities such as camping and hiking. In the future, national parks are expected to be natural classrooms. People can learn about different kinds of animals and plates through eco-friendly (环保的) travel activities.

The national parks can also be helpful to local people. The building of these national parks provides many jobs for local people. People living in or around the parks can work as park rangers (护林员) and guides. They can also sell some eco-friendly things with local color. So their yearly incomes (收入) will grow a lot.

Then let’s take a look at the five national parks.

A tree has roots. People have roots, too. If you get to the root of a problem, you will solve it. It’s the same thing with words. Dig deeply into a big, unfamiliar (不熟悉的) word and you will understand where it came from.

As readers, especially those reading in a second language, we need to deal with the text as if we were detectives (侦探) looking for information to unlock the unknown. Like any good detective arriving on the crime scene, the first thing to do when meeting a new and difficult word is to judge (判断) the situation, to look at everything that is known and see if it helps us to understand what means.

As you know, prefixes (前缀) and suffixes (后缀) can be added to the beginning or end of words to change the meaning. Know them, and you will have the word building power. But root words are the key. Take time to learn a few of these, put them in your memory, and you will become a master word detective.

Let’s look at one common root word used in English. “Alter” from the Latin word means “other”. When you meet this root word, you know that the bigger word has something to do with “other”. Examine the word “alternate”. Can you find the Latin root in it?

Learn as many root words as possible in the language you are studying. Then use your “rooting for words” skills. Like any new skill, practice and hard work are always paid back.

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It’s important to learn how we can protect the environment. Here are 5R rules for us.

Reduce

If you want to reduce waste, you should use things more wisely.     31    . If everyone uses paper carelessly, soon we would not have any trees left. Other things are also being wasted, and people don’t know what to do with the waste in big cities. So it is necessary to reduce the amount of waste we produce.

Reuse

You should always think of reusing things before throwing them out. For example,     32    . In a family, you may pass on such clothes to younger brothers or sisters.

Recycle

Bottles, cans and paper can easily be recycled. By doing so we save lots of time and money. For example,     33    . The metal can be used to make new coke cans.

Recover

    34    . You have two choices: one is to throw the apples away, the second is to throw the rotten ones and keep the good ones. In this way, you are recovering the eatable parts of food.

Repair

If one of the legs of your table is broken, you should repair it. If you want to buy something newer and better, it is better for you to sell the old item, or     35    .

Learn the rules to protect our environment. Let’s try our best to make the earth cleaner and more beautiful.