Sheridan is a town in Indiana, USA. There are lots of trees near the public schools in the town. Their leaves turn sunlight into energy.

    In Sheridan, the Sun not just provides energy for plants. It keeps schools running, too. The schools use solar panels(太阳能电池板) to turn sunlight into energy.

    The science behind solar energy is not new. But Sheridan Community Schools is the first school district (学区) in Indiana to be completely solar-powered. The district finished putting in solar panels for all three of its schools in 2016. Some of the panels can turn to follow the Sun across the sky.

    In 2008, fewer than 1,000 schools used solar power. By 2014, there were 3,727 schools with solar panels in the USA. These numbers come from a report by The Solar Foundation. Roxie Brown, a programme director there, said that the number of schools with solar panels has continued to go up since 2014.

    Solar energy has some advantages over other energy sources (来源). Sunlight is a renewable source, which means it won't run out. Solar panels don't harm the environment. Also, sunlight is free. So by using solar power, schools can save money on energy costs. Brown thinks more schools should run on solar energy. "The Sun is Earth's energy source," she says. "We're trying to make it the energy source for our houses, cars and schools, too."

    But using solar energy isn't always easy. Solar panels can be expensive to put in. The panels also take up space. But for many schools, going solar is worth it.

    Red, green, blue, black and white are basic(基本的) colours.

    The world is colourful(多彩的). The sea is blue. The grass is green. Most countries in the world like green because it's a symbol(象征) of life(生命)，but people from England and Japan don't like it. Red is a popular(流行的) colour in China, but in Thailand(泰国)，it is bad to write names in red ink(墨水). It means someone is dead(死亡的). In Australia, people think the black cat can bring them good luck, but in America, people think the white cat is a lucky cat.

When tea and coffee were first introduced to Europe in the 18th century, people had different ideas about their use. Some said that tea and coffee were harmful to humans and they could cause(引起) people to die.

In Sweden(瑞典), King Gustaf III decided to find out whether or not this was true. It happened that there were two brothers in prison at that time. They were twins and were almost alike in every way. They had both been sentenced to death(判处死刑). The King decided to let them live if one of the men agreed to drink several cups of tea each day and the other several cups of coffee.

Both brothers lived many years without problems of any kind. At last, the brother who had drunk tea every day died at the age of 83, the other died a few years later.

Because of the experiment, tea and coffee got accepted(接受) and became popular as drink in Swe-den, and it is one of the many countries of the world where much tea and coffee is drunk today.

You never know when accidents will happen. It's important to be ready. Here are some survival (生存) skills for you when you are in trouble. 

Many people connect gratitude(感谢) with saying "thank you" to someone who helped us, making it a short act of appreciation. According to Robert Emmons, a leading researcher, gratitude is an emotion that can result in long-lasting positivity(积极性). {#blank#}1{#/blank#}

Gratitude is good for your health.

Through his research, Emmons found that grateful people reported feeling healthier and happier, both mentally and physically. {#blank#}2{#/blank#} In the workplace, employees who are shown that they are appreciated are healthier and more productive by 50 percent.
{#blank#}3{#/blank#}

Gratitude is a selfless act. We often take for granted the simple things in life. Those who recognize the goodness in life, no matter how simple, are more likely to be sensitive to the needs of others and to help whenever they can. Being considerate to others' opinions, experiences and backgrounds will make you a better person.

Gratitude makes us more self-aware.

Working in an ever-developing, fast-paced society, we are surrounded by ambitious people who are always struggling for more and better. {#blank#}4{#/blank#} It starts by paying attention to what's now going on in your life, and that's true self-awareness is the key to being successful.

Gratitude helps us build strong relationship.

Gratitude is a powerful tool for strengthening relationship, both at work and in your personal life. People who express their gratitude tend to be more willing to forgive others and therefore able to create long-lasting connections. 
{#blank#}5{#/blank#} Taking the time to thank people for their work and kindness — whether it was today, last month or many years ago-makes you happier and more self-aware.

注意：（1）文章需包括表中的全部信息，可适当发挥；（2）文章中不得出现真实姓名和学校名等相关信息；（3）词数80-100。