The word 'day' has two meanings. When we talk about the number of days in a year. We are using 'day' to mean 24 hours. But when we talk about day and night. We are using 'day' to mean the time between sunrise and sunset. Since the earth looks like a ball. The sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place. is moved from day into night and from night into day over and over by the spinning(旋转)of the earth. At the equator(赤道)day and night are sometimes the same length, they are each twelve hours long. The sun rises at 6 o'clock in the morning and sets at 6 o'clock in the evening. For six months the North Pole is tilted(倾斜)toward the Sun. In those months the Northern Hemisphere(半球)gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the SUN. Then the Southern Hemisphere gets more sunlight. Days are longer than nights. North of the equator nights ate longer than days. Winter is the season of long nights. Summer is the season of long days.

Today, many students are always stressed out. They are often too busy to think{#blank#}1{#/blank#} their diets and exercise. Healthy eating, along with regular(定期的) exercise {#blank#}2{#/blank#} (keep) you healthy. Do you think it is the only way to keep us in {#blank#}3{#/blank#}(healthy)?

As we know, it is important to give your body the energy it needs. Teenage girls {#blank#}4{#/blank#} (need) about 2,200 calories(卡路里) a day and boys need a bit more. {#blank#}5{#/blank#} (fiftieth) percent of your calories should come from rice, bread, {#blank#}6{#/blank#}(vegetable) and fruit. You also need to d{#blank#}7{#/blank#} a lot of water, six to eight glasses a day. Enough water will improve your skin and give you healthy hair.

Exercise can help to make you look good, feel good {#blank#}8{#/blank#} be healthy. Scientists suggest that teenagers should spend at{#blank#}9{#/blank#}(little) 30 minutes exercising every day.

Exercise can make you feel {#blank#}10{#/blank#} (relax)and energetic. It can even help you sleep better at night.

Let's eat healthily and take more exercise.

With our already busy lives, finding time to exercise can be impossible. So maybe it would help if there was ‘a best time' to exercise.

There are clear benefits to exercising in the morning. Many of us have more free time than later in the day, and it may be easier for us to keep a morning plan. A study found that people could sleep better when they exercised in the morning or had the physical activity during the whole day. Exercising on an empty stomach（空腹）before breakfast could also have less fat（脂肪）and keep healthier.

So, good news for early birds, but what if you're not a morning person? Working out in the afternoon or evening is also good, but different. For example, your body's ability reaches the highest level in the afternoon, according to a 2010 study. Also, in the afternoon and evening, your mind is the quickest, and your heart rate and blood（血）pressure are lowest, and you aren't getting hurt（受伤）easily when exercising.

But can this happen? Deciding on if you are a man or a woman? Our bodies are different, after all, so the best time to exercise may be different too. Want to reduce（降低）your blood pressure and you are a woman? Exercise in the morning. Want to improve your heart health and you are a man? Evening is better for you. But, a 2022 study found that it's both OK for them to exercise at either time of day.

So what time is best? It seems the answer is: whatever time is best for you!

Perhaps you have heard a lot about the Internet, but what is it, do you know? The Internet is a network. It uses the telephone to join millions of computers together around the world.

Maybe that doesn't sound very interesting. But when you've joined to the Internet, there are lots and lots of things you can do. You can send E-mails to your friends, and they can get them in a few seconds. You can also do with all kinds of information on the World Wide Web (WWW).

There are many different kinds of computers now. They all can be joined to the Internet. Most of them are small machines sitting on people's desks at home, but there are still many others in schools, offices or large companies. These computers are owned by people and companies, but no one really owns the Internet itself.

There are lots of places for you to go into the Internet. For example, your school may have the Internet. You can use it during lessons or free time. Libraries often have computers joined to the Internet. You are welcome to use it at only time.

Thanks to the Internet, the world is being smaller and smaller. It is possible for you to work at home with a computer in front, getting and sending the information you need. You can buy or sell whatever you want by the Internet. But do you know 98% of the information on the Internet is in English? So what will English be like tomorrow?

The winter solstice, or dongzhi, is the 22nd of the 24 solar terms(节气) in the Chinese lunar calendar. It usually happens {#blank#}1{#/blank#} December 21st, 22nd or 23rd. People in different parts of China have different customs on this day. 

Eating dumplings, or jiaozi, is a common custom for many Chinese on the winter solstice, {#blank#}2{#/blank#} those living in the north. Why do we eat dumplings on this day?

It is said {#blank#}3{#/blank#} this custom is to remember Zhang Zhongjing, a famous doctor of the Eastern Han Dynasty. He was the {#blank#}4{#/blank#} person to make them. People called this food "Jiao'er" for its shape at that time. During the Three Kingdoms Period(三国时期), dumplings became a popular food. In the Song Dynasty, dumplings{#blank#}5{#/blank#} to Mongolia(蒙古). Influenced by Mongolians, dumplings had {#blank#}6{#/blank#} fillings(馅) . Then Mongolians spread {#blank#}7{#/blank#} to all over the world. 

From the Qing Dynasty, dumplings became a must on Chinese New Year's Eve. Family members gather together to make dumplings and eat them. {#blank#}8{#/blank#}eating dumplings, they probably care more about the {#blank#}9{#/blank#}atmosphere(氛围) of the festival. 

No words can {#blank#}10{#/blank#} Chinese people's love for dumplings . The food has already become a symbol of home and warmth. 

Not long ago, our city built a new museum. The museum is great for people of all ages. What's more,{#blank#}1{#/blank#}(进入许可) to the museum is free. No wonder a lot of people go to visit it. 

Last Saturday I went there to find some{#blank#}2{#/blank#}(信息) for my homework. Before we entered it, our {#blank#}3{#/blank#}(导游) told us some rules of the museum. First, it was{#blank#}4{#/blank#}(违反) the rules to take photos. Then, we mustn't {#blank#}5{#/blank#} (触 摸) the paintings on the first floor. And we must keep {#blank#}6{#/blank#}(安静的) in the museum. He said, "If you break the rules, someone will {#blank#}7{#/blank#}(惩罚) you. So if you don't want to be in {#blank#}8{#/blank#}(问题;烦恼), you'd better follow the rules. Also, there are some{#blank#}9{#/blank#}(标志) in the museum that tell you what you can't do there. Please read them carefully and you can {#blank#}10{#/blank#}(当然) enjoy the trip. You can go now!"