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    Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive (存活) if the rain is spread throughout the year, If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

    Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

    There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay beneath (在……之下) a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing--very, very slowly--as these forces of nature continue to work on the rock.

    Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted (适应) to life in the desert. During the heat of the day a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

Hello! Welcome to our programme! I'm John. I'm in a health club now. I'm having a talk with four students. They are members of this club.

Do you like a small plant? The study shows that a small plant can improve our memory (记忆力) and make us happier. Even the small plants on your desk may have a more effect on you than you might realize. The small plants can help you to think more clearly. Studies have shown that the small plants could improve your concentration (注意力) by up to 20% and improve your ability to remember information by 15-20%. Plants can also reduce CO₂ and improve air quality.

"CO₂ should not pass 1,000 parts per million in the classroom." Doctor Zhang in the Health and Safety Center said. He said this level can cause headache and even lead to poorer decision-making. Studies have shown that sometimes indoors plants can reduce CO₂ from 2,000ppm to about 480ppm in less than one hour. Plants can increase happiness because there is endorphins (内啡肽) in humans. The shape, color, smell, feel and taste of plants can cheer us up and improve our memories.

 Do you like music? If you do, you can go to Harbin, a music city(城市) in China.

 In Harbin, you can see people playing music everywhere. They are in the park, in the street and in the music center. Some people play the violin, some people play the guitar and some people play the erhu.

____ But when they go to Harbin Music Museum, they' ll find it's also a music city. In the museum, people can watch great music shows. Some musicians in the shows play the violin and the piano. Some musicians(音乐家) in the shows play Chinese traditional instruments, like the erhu and the gehu. They show the stories of Chinese and Western (西方的) music to people together.

 People in Harbin are also good at singing and dancing. Many singers and musicians from other countries go to Harbin and live there. They sing, dance and play music with the people in Harbin.A lot of Chinese musicians go to Harbin, too. And lots of students also go there to learn music. These music lovers make Harhin a music city.

Do you know Harbin Summer Music Concert? The 36th Harbin Summer Music Concert opened (开幕) on August 6th,2023. It lasted (持续)42 days. In fact, there is Harbin Summer Music Concert for people every two years. Do you love it? Why not go to Harbin?