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China has many heroes in science. Nan Rendong is one of them who is well-known for his great (achieve) in building the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), the largest radio telescope (无线电望远镜) in the world.

Nan Rendong spent over twenty years (work) on this project. At first, he had to go to many far-away places across the country. Without good paths, he had to walk for hours (get) to proper spots. When he (meet) bad weather, like heavy rain and strong winds, he never complained. He faced lots of problems, he never stopped trying. His efforts and determination led to his success.

Nan was undoubtedly a man of great (intelligent) and responsibility (责任心). He always thought about the project first. When there was problem, he was always the first to come and help. He actually devoted (he) to his career. Even after his death, people still remember him and are proud him. His story tells us that if we keep trying, we will solve any problem. He is (real) a role model of our time.

Starting a research project can be difficult. Encyclopedias are powerful tools to begin your journey into any topic. They can make looking for information easier.

Know your focus

If you're researching climate change, you can ask: "What causes it? How does it affect oceans?" Books provide fewer useless things to look at than websites. This stops wasting time on unrelated things.

Start with overviews (概述)

Modern encyclopedias like World Book Encyclopedia give trustworthy (值得信赖的) summaries. Their complete introductions help you know key information before you learn more.

Check different sources

Compare encyclopedia entries with books on that topic or expert writings. A study of dinosaurs might use information both from pictures in Encyclopedia of Life and expert writings.

Organize information

Use apps to save online encyclopedia links (链接). For print forms, taking notes on pages helps a lot.

Mastering these steps makes research easier. As the famous saying goes, "Knowledge is power." And encyclopedias hand you the first key.

A. Here is how to use them wisely.

B. They provide "big picture" views written by experts.

C. Before opening any book, write down some questions.

D. Using both ways can make things clear and research better.

E. You should avoid using unreliable websites to protect your data.

F. When you find information from different sources, you can see different views on the topic.

The 1700s saw major changes because of the use of the printing press (印刷机). Famous sets like Diderot's Encyclopedia in France and Encyclopedia Britannica in Scotland were printed. This technology allowed many copies to be made, making encyclopedias easier to get to society, though they were still expensive. These books became valuable sources of information in homes, schools, and libraries.

In the 1900s, new forms like microfilm (tiny photo film) and CD-ROMs (computer discs) appeared. They stored huge amounts of text and images, making encyclopedias much lighter and easier to carry than heavy book sets. However, the biggest change came with the internet. Free websites like Wikipedia (started in 2001) let anyone with a device find knowledge right away. Most importantly, they allow ordinary people worldwide to write, edit and update (给……增加最新信息) articles together—unlike traditional encyclopedias created only by experts. Today, online forms include videos and sounds and are available (可获得的) in many languages, keeping the ancient goal: to share knowledge with everyone globally.

Science & Health

Numbers keep us safe and healthy. Builders use special numbers like 3.14 (π) to make strong bridges that won't fall down. Doctors use numbers like 37℃ (normal body temperature) and 60-100 beats per minute (normal heartbeat) to check health.

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Numbers tell us about people. Did you know that Asia has around 4.8 billion people? That's more than half of all people on Earth! Leaders use these numbers to decide how many schools to build. In bad times, numbers help decide how much food or medicine is needed. Stores even use numbers to know which products sell well.

Everyday Uses

We see numbers every day. When baking a cake, you need twice as much flour as sugar. At stores, a 20% discount means you can pay less money. On the road, signs like "60 km/h" tell drivers the maximum speed. Dates also use numbers, like "June 26th".

There are also some fun facts about numbers. People think differently about some numbers. In China, people believe that the number 8 means good fortune. Meanwhile, in some Western countries, people think 13 is unlucky.

        Numbers help us describe everything—from small things to huge stars. They are the world's special language.

Clouds are floating (漂浮) water drops. They are made of small water drops. Each drop is made of many water molecules (分子). They stay together around a piece of dust. How2 are cloud drops? A shoebox of clouds might3 millions of cloud drops.

Clouds are4. They look light and soft, but they hold a lot of water. The water in an average (普通的) cotton-ball cloud may have a5 as much as that of a group of elephants.

Do you dream of walking on a cloud? It would probably be very6 and wet. You would even have no comfortable7 to sit down. But weather balloons found insects inside clouds as high as 20 miles above the earth. The wind blows most of the insects into clouds. Butterflies were once found at 10,000 feet (英尺).

Clouds don't last. They are always8. When the wind blows them, they will change their9. Will the shapes stay long? Some big clouds can last around all day. But some small soft clouds often last 10 minutes. So take a look at the cloud before it10. What does that cloud look like?

Mary在学校参加了一个Buddy Club，从那以后，她改变了很多。请你结合下面所给的提示，写一篇英语短文。

要求:

1. 覆盖要点，可以合理增加细节；

2. 80词左右，开头与结尾已经给出，不计入总词数。

Joining a club sometimes changes a person greatly. _____________________________

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People sure change all the time, right? What we should do is to learn from Mary. Change ourselves and choose to be the best of ourselves.

My daughter, Cindy, used to be shy but now she's kind of active and outgoing.

I still remembered one thing. One day last month, Cindy got an upset stomach, so I took her to see a doctor. When we waited in line outside the waiting room, we saw a lady beside us. She looked very upset. Then Cindy gave a Smile card to the lady, saying, "I hope everything goes well." The lady hugged (拥抱) Cindy and said nothing. Later, Cindy gave out five more Smile cards that day.

Last Monday, I went shopping with Cindy in a supermarket. After shopping, we went to the cash register (收银台). To my surprise, I couldn't find my wallet and I didn't know what to do. At that time, a lady came to us and paid for the bill for us. She was just the lady who was at the doctor's that day. I said "thank you" to her. She said, "I was moved by your daughter's kindness." Then I returned the money to her the next day.   

Now our family members always enjoy helping others. And giving out Smile cards is a good way to help.

1. Instead of being, Cindy is now active and outgoing.

2. While in line, Cindy saw the lady for the first time.

3. Cindy helped the lady by her a Smile card.

4. Cindy gave out Smile cards altogether that day.

5. The lady paid the bill for them because of Cindy's.

Electronic (电子的) books, or e-books, have changed the way many of us read. Now electronic textbooks are changing the way many students . Many schools in Washington have begun using online course materials (材料). Rather than use a regular textbook, it's all online.

"Our students are ready to use resources (资源) in different ," said the head teacher, Peter Norman. He talked about the of electronic textbooks to a reporter, "The world is changing . Online textbooks can change right along with the things that are happening. Besides, electronic textbooks less than regular textbooks. Every term our students need to pay about $150 for regular textbooks, but now they only need to spend about $100 electronic textbooks."

Students have different ideas about the change, most like it.

"I don't have to carry a textbook around, so that is ," said a high school student named Melanie Reuter.

Maria doesn't . She said, "I don't like it because the Internet sometimes doesn't work."

Some students don't have a computer or can't go online at home. Stephen is of them. But he said, "I can go to the library or a friend's house to surf the Internet."

2 people take grasslands for granted (认为……理所当然).3 it's a sunny day, people will sit on a bed of grass and relax in the sun's warmth. This gives you the4 to listen to surrounding (周围的) nature. Maybe it's a bird singing to another, or the soft5 that brings you cool air.

Also, on campus (校园), grass fields act like a soft study6 for students to read books and learn on. Or it can be7 to just talk, laugh and play on.

Besides, families love spending their weekends on the grass in parks. There, families can8 a picnic and children can play games with each other.

However, there is a rule to9 the green grass. In some parks, there are different grasslands for people to relax and play sports on. If people want to relax, they'd better choose the right field, or they10 feel the full force of a flying soccer ball!

Black is the colour of power. It is also2 in fashion because it makes people appear3.

White is the4 of purity. White is thought to be a5 colour. However, white shows dirt and is more difficult to6 clean than other colours.

Blue is the colour of the sky and the7. Peaceful blue is often used in bedrooms. Studies show that weightlifters (举重运动员) are able to8 heavier weights in blue gyms.

Green represents9. It is good for our eyes. Hospitals often use green because it10 patients and keeps them peaceful.

Once Uncle Li went to town to buy some medicine for his wife. In the town he heard the apples in a city were expensive. He told Uncle Wang about it as soon as he went back. They decided to carry some apples to the city. They borrowed some money from their friends and bought nearly 1，000kilograms of apples in the villages and carried them to the city on a tractor. Bad luck!A lot of apples has already been carried there when they arrived. A few days later they had to sell them at a low price （价格）. They felt unhappy and returned to their village.

"I can't understand why we sustained （蒙受） losses in business while others always profit （盈利）"Uncle Li asked one day. "The tractor was too small"Uncle Wang said without thinking. "We'll carry more apples on a truck next time!"I agree!"said Uncle Li. "How foolish （傻的） we were!"

Although Billy can't see, he has never let that hold him back or make him different. Billy began teaching himself computer programming by using a screen reader when he was just seven years old. He is a certified Google developer (谷歌认证开发者) now. Google even tried to offer him a job last year when he discovered a problem in one of its systems, but Billy wasn't old enough.

Billy's dream school would be Stanford University or MIT, where he could get a very good education in computer science. After he leaves school, whether he will go to work at a company like Google or design a software company of his own is still to be decided. However, he says he will definitely (绝对地) do something great.

"It's a sighted world," Billy said. "You can't let anything get in the way of your dreams, and if you do that, you can't move forward and make your dreams come true."

US First Lady Michelle Obama, along with her mother and two daughters made their first trip to China from March 20 to March 26. They went to Beijing, Xi'an and Chengdu.

In a speech at Beijing University, Mrs Obama encouraged students to study abroad.

"It's not enough to get good grades in school," she said in the speech. "It is better to travel 10,000 miles than to read 10,000 books. The experiences in other countries help make our life successful. By learning each other's languages and by showing such curiosity (好奇) and respect (尊重) for each other's cultures, you are building bridges of understanding and bonds of friendship," she said. The US is the top destination (目的地) for Chinese students. More than 200,000 Chinese students are now studying in the US. In 2009, US President Barack Obama announced (宣布) his goal of sending 100,000 students to China. Since then, more than 68,000 US students have come to China. What's more, many kids in the US are now studying Chinese. "Learning Chinese is a cool thing in school. It is good for our future," said Mason Grabowski, 14, a student from Chicago. "It is a hard language, but it is never too early to start learning it."

get home earlier, he didn't rest on his way.