1）问候昔日同桌，回忆同学友情；

2）校庆活动介绍；

3）捐设奖学金。

参考词汇：百年校庆100th anniversary celebration; 奖学金scholarship

Dear Peter,

    Do you ever notice the music playing when you enter a store? No? Often it is very difficult to point out. It is similar to the music you listen to, but it is not the same. The music played in stores is changed to be more relaxing and to give you more mental energy. This style of music is called “elevator music.”

    Elevator music is also referred to as Muzak. Muzak is very commonly listened to in the USA. About 1/3 of Americans will listen to Muzak for about 15 minutes a day in order to relax themselves. The music is played and contains short pauses. The most common time to hear elevator music played is between ten and eleven in the morning, and three to four in the afternoon. This is when most people are the most tired and could use the extra energy.

    Elevator music is often played in public places because it is designed to make people feel less lonely and refreshes their brain. It has been proven that Muzak does what it is supposed to do. Studies have shown that tired office workers have more energy when Muzak is played in the background of the office. In addition, factory workers produce 13% more and shoppers buy 38% more groceries in a supermarket when listening to Muzak.

Some people do not like Muzak. They say it's boring to hear the same songs all the time, but other people enjoy hearing Muzak in public places. They say it helps them relax and feel calm. Often you may recognize the songs being played. That is because many of the songs have been bought from the musicians or songwriters. Some of them do not like their music to be used for Muzak but others are happy when their songs are chosen. The top musicians that allow their music to turn into Muzak music can make up to 4 million US dollars a year. One way to another, Muzak affects everyone.

    What is eco-fashion? Eco-fashion is about making clothes that considers the environment, the health of consumers and the working conditions of people in the fashion industry.

    A closer look at the fashion industry points out many problems that are common practices in the creation of our fashions from the field to the factory. Firstly, the production of textiles pollutes the environment heavily. Cotton-planting uses pesticides; sheep-farming and wool-cleaning bring about global warming. Secondly, every stage of clothing production consumes a great deal of energy and some also involve chemicals which obviously do harm to the surroundings. In addition, there is a lot of waste produced in the process, especially in the form of polluted water. Thirdly, growing purchasing power and our shopping habits further worsen the bad effects. We are now buying clothes in increasing quantities and we are also quick to throw away clothes that have been worn only a couple of times.

    Then, how to solve the problem? To a large degree, it is the fashion producers that really have the power and the responsibility to shape our future. There are a great many ways these producers can reduce their ecological footprint, from switching to green energy and reducing energy use, through selecting sustainable materials and choosing local suppliers, to recycling and minimizing waste. On the other hand, as consumers we can all play our part by selecting environmentally friendly clothing and reducing clothing buying.

    There is some concern that eco-friendly fashions are just a trend that we will eventually grow tired of but we can make sure that doesn't happen. Now many people are beginning to shop for organic food products because the benefits of eating food free of chemicals are immediate. They relate directly to our personal health. In fact, choosing eco-fashion can also do good to our personal health, though it is mostly done by way of keeping the health of the planet.

    Sadness and depression?

    Sadness is normal human emotion that everyone experiences at some time. A number of events can leave people feeling sad or unhappy, such as the loss or absence of a loved one, divorce, loss of job or income, financial trouble, issues at home, or social anxiety.

    Failing an exam, not getting a job, or other disappointing events can also trigger sadness.

    However, a person who is sad can usually find some relief from crying, venting, or talking out frustrations. This is because sadness is more likely to be linked to a specific trigger.

    Sadness usually passes with time. If it does not pass, or if the person become unable to function normally, this could be a sign of depression. If symptoms worsen or last longer than 2 weeks, the person should talk to their doctor.

    Depression is a mental disorder that affects every part of a person's feelings and perception. It affects behaviors and attitudes and can affect people of any gender or age.

    In 2015 around 16.1 million people aged 18 years or above in the U. S. had experienced at least one major depressive episode in the last year. This represented 6.7 percent of all American adults. Symptoms include feelings of discouragement, sadness, hopelessness, a lack of motivation, and a loss of interest in activities that are normally enjoyable. In severe cases, the person may think about or attempt suicide.

    The person may no longer feel like spending time with family or friends. They may stop pursuing their hobbies and feel unable to go to work or school.

    Daily habits may change unexpectedly and without reason. A person with depression may find it difficult to continue doing the things they normally enjoy.

    If these feelings of doubt last more than 2 weeks, a health-care professional may diagnose the person with major depressive disorder (MDD).

    Unlike sadness, depression can leave a person struggling to express their feelings. If the person tries to release the stress, the overpowering feelings and negative thoughts can prevent them from building themselves up again.

Teens' Sleep Shortage

    Most teens need about 8 to more than 9 hours of sleep each night. The right amount of sleep is essential for anyone who wants to do well in tests or sports. And lack of sleep affects everything from a person's ability to pay attention in class to his or her mood. It also damages teens' ability to do their best in athletics. Unfortunately, research shows that many teens don't get enough sleep, and more than 20% of high school students fall asleep in class.

    Until recently, teens were often blamed for staying up late, oversleeping for school, and falling asleep in class. But recent studies show that teens' sleep patterns actually differ from those of adults or kids. These studies show that during the teen years, the body's biological clock is temporarily reset, telling a person to fall asleep later and wake up later. This change might arise from the fact that the brain hormone melatonin (褪黑素) is produced later at night for teens than it is for kids and adults. This can make it harder for teens to fall asleep early.

    These changes in the body's biological clock are in line with a time when they're busier than ever. For most teens, the pressure to do well in school is heavier than when they were kids, and it's harder to get by without studying hard. And teens also have other time demands — everything from sports and other extracurricular(课程外的) activities to fitting in a part-time job to save money for college.

    Early start time in some schools may also play a role in this sleep shortage. Teens who fall asleep after midnight may still have to get up early for school, meaning that they may only squeeze in 6 or 7 hours of sleep a night. A couple hours of missed sleep a night may not seem like a big deal, but can create a noticeable sleep shortage over time

The way of Chinese people's life has been changed through the China's" New Four Great Inventions". What are" New Four Great Inventions"? They are High-speed rail, Shared bikes, Online shopping and Alipay.

What did the China's" New Four Great Inventions" bring to us?

High-speed rail—Modern transportation makes everybody neighbor. The invention of the high-speed railway makes it easy to thousands of miles a day. Today China's rail transit technology is the best, the China's daily average of 4, 000 trains, sending about 4. 6 million passengers.

Shared bikes—Short walks become more convenient and faster, and carbon emissions are reduced, which is friendly to the environment. You can download the APP about shared bikes, pay some money, and then you can use bicycles everywhere in the street. The Chinese shared bicycle programs have been becoming more and more popular.

Online shopping—Don't need to go out to find the needs for living. Online shopping, as the name implies, is to pay money online. Purchases(购买物) can be sent home. China has 751 million Internet users, 724 million mobile phone users; total transactions on November 11 and December 12 hit a record high every year. Online shopping lets Chinese Internet users enjoy" shopping carnival" every day.

Alipay—A software which can replace cash payments. With intelligence phones' popularization, Alipay has become an indispensable (不可或缺的) APP. Through scanning the " QR code", Alipay wants to realize the ambition of " replacing cash payments" gradually. On 11th November 2018, both the mobile payment account and the transaction reached 213. 5 billion.

There is no doubt that China has already used its own power of" New Four Great Inventions" to become the great powerful technological country, showing the power of China once again.