There are many kinds of trees. All trees have roots. The roots hold trees in the ground. The roots soak up ( 吸收 ) water and food. Then trees get water and food from the roots. You can't see inside a tree. But you can study how water moves through trees.

    First, get a stalk ( 茎 ) of celery ( 芹菜 ) and cut off its end. Put red colour in a cup of water. Then put the stalk of the celery into the red water. Then we can see the red water moving up in the celery easily.

    After half an hour, take the celery out. Cut it in half. Your celery should be red. This is because the water moved up the stalk. Water moves through trees in the same way as it moved through the celery.

    What's a spacewalk? Any time an astronaut gets out of a spacecraft(航天器) while in space, it is called a spacewalk. Astronauts go on spacewalks for many reasons. For example, experiments can be placed on the outside of a spacecraft. This lets scientists learn how being in space affects(影响) different things. By going on spacewalks, astronauts can also fix things instead of bringing them back to the earth to fix.

    When astronauts go on spacewalks, they wear spacesuits to keep themselves safe. Inside spacesuits, astronauts have the oxygen(氧气) they need to breathe and the water they need to drink. To keep the astronauts and the spacecraft safe, the astronauts must leave and go back to the spacecraft through a special door. When on a spacewalk, astronauts use safety tethers to stay close to their spacecraft. Tethers are like ropes, connect the spacewalkers with the spacecraft. They keep astronauts from floating(漂 浮) away into space. Another way astronauts stay safe during spacewalks is by wearing a SAFER. SAFER is worn like a backpack. It helps an astronaut move around in space.

    How do astronauts train for spacewalks? One way is by going for a swim. Floating in space is a lot like floating in water. Astronauts practice spacewalks underwater in a huge special swimming pool. For every one hour they will spend on a spacewalk, astronauts need to train seven hours in the pool. Another way astronauts practice for a spacewalk is by using virtual reality(虚拟现实). It looks and feels just like a spacewalk.

    Today, only three countries have finished spacewalks independently. They are Russia, the United States and China. The first person to go on a spacewalk in the world was Alexei Leonov from Russia. Zhai Zhigang is the first Chinese astronaut to go on a spacewalk. The world record of spacewalks is held by Russian astronaut Anatoly Solovyev. He has been on 16 spacewalks and spent more than 82 hours outside in space.

    Some insects, such as butterflies and ladybugs, are quite beautiful, {#blank#}1{#/blank#}did you know that many insects are also edible(可食用的)?

    Aletheia Price knows this—and a lot more about –about bugs(虫子). She also thinks that you should try {#blank#}2{#/blank#}some. If you visit the website www. eatbug.com, you will find all kinds of{#blank#}3{#/blank#} about edible insects. Most of it was {#blank#}4{#/blank#}by Aletheia Price when he was fifteen years old. Aletheia started eating bugs at the age of thirteen. Soon, she found that she really {#blank#}5{#/blank#}eating some of them. She also became interested in finding out more about which kinds of bugs could be eaten and {#blank#}6{#/blank#}to cook them.

    According to Aletheia, there are at least 1,462 kinds of edible {#blank#}7{#/blank#}. Some of her favorite dishes include mealworm, chocolate, chip, cookies and chocolate-covered crickets(蟋蟀).

    Aletheia knows eating bugs is not for {#blank#}8{#/blank#} . But if you think about it, you may feel that eating bugs is a good {#blank#}9{#/blank#}. There are millions and millions of edible bugs in this world. If you could get to used to eating {#blank#}10{#/blank#}, we would have plenty of food for everyone.

Giraffes are the tallest animals on the Earth. Male giraffes can grow to a h{#blank#}1{#/blank#}of about 17 feet. An adult giraffe can look into your bedroom window on the second floor.

Giraffes only live on the continent of Africa. The only giraffes in China are f{#blank#}2{#/blank#}in zoos or animal parks. V{#blank#}3{#/blank#}love to see the giraffes because they are so tall.

Giraffes love to eat leaves. With their longest necks, they can e{#blank#}4{#/blank#}eat leaves from the tops of trees. Giraffes don't d {#blank#}5{#/blank#}much water. They get much of the water they need from the leaves they eat.

Li Hua and Wang Tao are two students of Class 4, Grade 7. They both like sports. Li Hua is a basketball fan. His favorite sport is playing basketball. Yao Ming is his favorite basketball player. He wants to be a basketball player like Yao Ming when he grows up. Li Hua is on the school basketball team now. Every Friday afternoon, Li Hua plays basketball with his classmates after class.

Li Hua's friend Wang Tao isn't good at basketball, but he is very good at soccer. Ronaldo is his favorite soccer player. Wang Tao is on the soccer team. He plays soccer with his teammates (队友) every Tuesday afternoon.

Walking around the city，you will see girls wearing hanfu on the underground or people wearing T—shirt with Chinese characters in the streets.A new trend （潮流） is getting popular in China.It's guochao or China—Chie.Guochao adds traditional Chinese culture into products

Guochao got people's attention in 2018.Before that，the market was controlled by foreign companies.There were few Chinese brands.To win the market share，many Chinese brands followed the footsteps of these Western brands.In 2018，but also included elements（元素） of traditional Chinese culture.It quickly caught people's attention at home and abroad.And it created amazing sales.

Later，many Chinese brands，from food，started to add Chinese culture into their products.Even the film and music industries made every effort to create Chinese styles."We want our products to be the ones that young people would like to share."They said.

These brands got what they wanted.Young people gradually converted their attention from Western culture to guochao.They accepted it with pleasure.What's more，they started to develop interest in traditional Chinese art and literature.Now they wear traditional clothes，practice Chinese calligraphy（书法）

No matter how guochao develops，there is one thing that won't change——people's confidence in our country's development and culture is growing.