Did you know that tea, the most popular drink in the world was invented by accident? Many people believe that tea was first 1 about 5,000 years ago. It is said 2 a Chinese ruler called Shen Nong was the first 3 tea as a drink. One day Shen Nong was boiling drinking water 4 an open fire. Some leaves from a tea plant fell into the water and remained there for 5. It produced a nice smell so he tasted the brown water. It was quite 6, and so, one of the world's favorite drinks was invented. A few 7 years later, the book called Cha Jing described how tea plants 8 and used to make tea. The tea trade from China to Western countries 9 in the 19th century. This helped to spread the 10 of tea and tea plants to more places around the world. 

    Hello，I'm Peter. I come from Japan．I can speak a little English and French. But I can't speak Chinese. I get up at 6: 00 and go to school at 7: 30 in the morning. I like P.E. best at school. It is exciting. I don't like math. I think it is difficult and boring. I want to visit China. I want to learn kung fu.

    My name is Jill. I come from the USA. I'm 13 years old. I go to school at 7: 40 and I go home at 5: 00 in the afternoon. I have lunch at school. I like music best. It is relaxing. I want to join the music club.

    I'm Mark. I'm from England. I can speak English and a little French, but I can't speak Japanese. I like art and I want to join the art club. I also like math, because it is interesting and fun. I have a pen friend in China. His English name is Jack. I want to see him one day.

What are in their schoolbags？

The Long March 5 Y3 is China's strongest rocket.

    China's biggest and most powerful carrier (运载) rocket roared (轰鸣) into space on Dec 27, 2019. The Long March 5 kicked off its mission (任务) at the Wenchang Space Launch Center in Hainan.

    The 57-meter-tall rocket, known as the Long March 5 Y3, is the tallest, strongest and most technologically sophisticated (技术复杂的) rocket in China. Since it is much bigger than China's other Long March rockets, people call it "Fat 5". The rocket is able to carry spacecraft (航天器) weighing up to 25 tons – roughly the weight of 16 midsize cars – into low-Earth orbit (近地轨道), China Daily reported. This payload capacity (有效载荷) is about 2.5 times greater than that of any other Chinese rocket.

    During the December launch, the Long March 5 successfully sent the Shijian 20 experimental satellite into orbit. At more than 8 tons, it is the heaviest and most advanced communications (通信) satellite built by China.

    The launch also tested key technologies that will be used to take the Chang'e 5 probe (探测器) to the moon, according to the China National Space Administration.

    The success of the Long March 5 launch was hard-earned. The rocket's first launch was carried out in November 2016 at the Wenchang center. A second mission took place in July 2017 at the same site, but failed to send a satellite into orbit. According to project leaders, in the two years since that failure, the rocket's research team held more than 600 seminars (研讨会) and carried out at least 1,000 experiments and tests to improve the rocket.

    "Compared with the Long March 5 Y2 that was used in the failed second mission, the new one has about 200 technical improvements, including changes to the engine design," Li Dong, the rocket's chief designer (总设计师), said to China Daily.

    The future missions of the Long March 5 will include a trip to Mars, taking back moon samples (样本), and placing parts of a manned (载人的) space station into orbit. 

The weather is getting hotter and hotter. You are thirsty playing basketball or riding home from school. A cold drink may be just the thing. But be careful what you are drinking. Something that looks cool may not be good for your health.

There are plenty of "energy drinks" advertisement on TV. Most of them have beautiful colors and cool names. They tell you they are helpful to your health. Sounds great and lots of people believe them!

But after a careful check you may find that most energy drinks have lots of caffeine (咖啡因) in them. These drinks are especially aimed at young people, students, busy people and sports players. Makers sometimes say their drinks make you better at sports and can keep you awake. But he careful not to drink too much.

Caffeine makes your heart beat fast. Because of this, the International Olympic Committee has limited (限制) its use. Caffeine in most energy drinks is as strong as that in a cup of coffee or tea. Possible health dangers have something to do with energy drinks. Just one box of energy drink can make you nervous, have difficulty sleeping and can even cause heart problems. Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them.