Here is a story: A man sees a butterfly (蝴蝶) . The butterfly tries to get out of its chrysalis (蛹) . F{#blank#}1{#/blank#}sorry for it, the man decides to help. He cuts the chrysalis and the butterfly comes out e{#blank#}2{#/blank#}. Surprisingly enough, the butterfly is unable to fly. If the butterfly doesn't struggle (挣扎；奋斗) to leave the chrysalis, it can't fly！The struggle develops the e{#blank#}3{#/blank#} in the butterfly which makes it fly. Similarly, the challenges of life bring out the best in young people and make the fly.

When people are young, meeting and overcoming challenges will make them s{#blank#}4{#/blank#} and ready to face life.

When we look at successful people, we see that the most successful of them are people who have had to struggle.

One famous businessman, who now o{#blank#}5{#/blank#}many big supermarkets, used to carry clothes on his back and sell them from door to door when he was young. Another successful man is Dennis. His father died when he was only twenty. He had to b{#blank#}6{#/blank#}up a big family. He took up the challenges and overcame them. Today his brothers and sisters are leading s{#blank#}7{#/blank#} lives.

Sometimes challenges do not appear to us because we keep away from them. So, some parents and teachers actively encourage young people to face challenges. They might organize some a{#blank#}8{#/blank#}for young people which provide them with challenges, like rock—climbing, camping, volunteer work and so on. However, just passing exams will not prepare a person for life. We must meet and overcome challenges. The young people of today will become the leaders of t{#blank#}9{#/blank#}. For countries to continue to become successful, it is i{#blank#}10{#/blank#}that the young people learn to meet challenges and overcome them.

Nowadays, "toilet revolution" is a thing in China.China is investing seven billion yuan in the project.The money is spent building or upgrading (改进) toilets in 30,000 villages.

Experts have agreed that a "toilet revolution" is very important.Better toilets mean healthier lives and better living standards.Better toilets can also help encourage tourism and improve the economy.

"Toilet revolution" was started in 2015.Chinese president Xi Jinping then called for improvement to toilets across China.The government has invested more than 1.6 billion yuan in the project since then.Nearly 70,000 toilets have been built or upgraded.By the end of 2017, 45 percent of rural residents (居民) had been using standard toilets.In 2013, that number was only 36 percent.

In cities popular with tourists, more expensive toilets have been built.These toilets have ATMs, Wi­Fi and recharging (充电) stations for mobile phones.Some toilets, meanwhile, have been expanded (扩大). Now, they have special cubicles (隔间) for the disabled and adults with young children.

China, in fact, is not alone in focusing on toilets.According to Bill Gates' foundation, forty percent of the world's population doesn't have flush toilets.UNICEF (联合国儿童基金会) says at least 1.2 million young children die of diarrhea each year.Contact with human waste is the main cause.Gates says toilets of the future will be able to save 800 lives every day.

This month, we went on a five day trip to Xishuangbanna, a beautiful place in the south of Yunnan Province. The weather there is hot and wet. There a {#blank#}1{#/blank#} many kinds of plants and animals. I want to i {#blank#}2{#/blank#} some interesting things we saw to you during our trip.

In the jungle(丛林), we saw a twining(缠绕的)plant. These P {#blank#}3{#/blank#} grow when seeds-seeds mainly from banyan tees (榕树)are moved by animals or wind to some other trees. These seeds gradually grow, developing their own aerial (空气的) roots. Little by lite, they will get themselves around the host tree and f {#blank#}4{#/blank#} kill it, just like a snake kills its enemy.

A {#blank#}5{#/blank#} thing we learned is that when a tree gets big and strong, some of its aerial roots will grow into the ground and develop into a new tee, just like the way cell division (细胞分裂) works. The w {#blank#}6{#/blank#} tree will look like a small forest. I think this is quite a {#blank#}7{#/blank#}.

In the forest, you will sometimes find some red leaves among the green leaves. Why is that?

One reason is that the sunshine is very strong in Yunnan. The trees n {#blank#}8{#/blank#} use all of their leaves in order to do photosynthesis (光合作用) and grow, so the color of some of the leaves c {#blank#}9{#/blank#}to red.

We really enjoyed our trip to Yunnan. We learned a lot about n {#blank#}10{#/blank#} and had a rally fun time. I hope we can take more trips like this in the future.

The erhu is a traditional Chinese musical instrument. It is the most popular of the huqin family. In the Song Dynasty, musicians began to use this type of huqin to perform different kinds of music, and it became quite a popular instrument. With the rise of some forms of folk art, the art of the erhu developed quickly during the Ming and Qing Dynasties. It became an important accompanying (伴奏) instrument in different folk music. Now it is used in both traditional and modern music. It has even become a solo (独奏的) instrument. One of the most famous musical pieces played on the erhu is Erquan Yingyue by Abing.

The erhu used to be mainly played by common people, As the playing skills were passed down by oral (口传) tradition, there are few written records about the erhu that can be found. To study the history and the development of the erhu, historians usually turn to ancient paintings, sculptures and murals (雕塑和璧画). The earliest pictures of this instrument were found in Yulin Caves and Eastern Thousand Buddha Caves in Gansu Province.

Because of so many people's effort, the erhu becomes more and more popular around the world. In fact, we can hear the familiar sound of the erhu in many Hollywood productions, such as Kungfu Panda in 2012 and most recently, the Oscar nominated(提名)film Up in the Air(《在云端》). When people watch these movies, they also enjoy the special music of the erhu. The erhu is also called "Chinese violin" by many westerners, but in many ways, they are quite different.

When I was about ten, I was woken up by the shouts（喊声）of my sister one morning. She was hungry, but my mother wasn't at home, so I made a banana cake for her. Let me share the recipe with you.

What you need:

2 eggs  3 bananas  2 cups of flour(面粉)

2 spoons of baking powder(发酵粉)

1/4 spoon of baking soda (小苏打)

1/2 spoon of salt

2/3 cup of sugar

1/3 cup of vegetable oil(油)

What to do:

l  Mix(混合) together the flour, baking powder, baking soda and salt in a large bowl.

l  Add the vegetable oil. Then add a little sugar, and stir (搅拌) it.

l  Pour the eggs into the bowl and stir them well.

l  Add the bananas and stir them.

l  Turn the oven to 180℃.

l  Pour them into the oven（烤箱）. Bake（烘焙） the cake for 20 minutes.

l  Get the cake out of the oven, and cut it into pieces to eat.

Imagine （想象） walking into a movie theater without being greeted by the smell of popcorn. It's hard to believe, isn't it? For many people, popcorn goes hand in hand with movies. They can't have one without the other. But 1  did this happen?

The 2  between the two is younger than you may think. In the mid-1800s, popcorn was already a popular snack in America. Vendors sold it on the 3  . People, especially kids, loved this street food. In the early 1900s, vendors started to sell popcorn 4  movie theaters.

However, theater owners didn't like popcorn. They believed it would make the experience of watching a movie 5  enjoyable. Eating it would make too much noise during the silent movies.

Later, when movies added sound, the 6  noise problem went away. More and more people went to the movies. Some of them even secretly（秘密地） took popcorn into the theaters. Later, more movie theaters 7  . Some of them agreed people to eat popcorn while they were watching movies.

In the 1930s, the theater owners found that people didn't need to buy popcorn from street vendors. Because popcorn was 8  to make, they could make and sell it themselves. They did that and the smell of popcorn drew more people to their theaters. The 9  made a lot of money, and people enjoyed themselves at the movies.

Today, popcorn is still an important part of the movie-going experience. Roles, a man who once ate three bags of popcorn, said, "People come to theaters sometimes just for the 10 . They don't even care what is playing!"