Good writing starts with good ideas.If you write about things that you care about,you will write better.If you write about things that you don't care about,you'll be bored and your paper will not have many good ideas.

    Once you have a good idea,the next step is organization（组织）.Think through your paper before you start.Write an outline.You need to know what your main points are before you start your first paragraph.Use 2-4 main points, one paragraph each.

    In your central paragraphs,be concise and specific（简洁具体）.Give examples with details,not just general ideas. If you can say the same thing with fewer words,do it!Don't use big words.

    When you finish writing,look at your outline again.Did you really follow it or did it change as you wrote?Many times you find different ideas as you write.Look at your central paragraphs.What are their main ideas now?Are theses ideas in the introduction?I often write the introduction again to fit the paper after I finish writing.

    If you see a group of people dancing and singing on the street or in the railway station, you don't need to feel surprised. They are a flash mob(快闪族), which is a group of people who come together suddenly in a public place, do something unusual for a brief period of time, and then quickly break up. They are usually organized with the help of the Internet or other digital communication network. At a predetermined(预先决定的) time, they gather and perform some distractions(消遣) such as waving their hands and exchanging books. Then, they quickly break up before the police can arrive. Using mobile phones, the flash mob can change its location if the first one has been replaced for any reason.

    Bill Lasik, senior editor of Harper's Magazine, organized the first flash mob in Manhattan in May 2003 and the first successful flash mob came together on June 3, 2003 —after the first attempt failed at Macy's department store. Lasik claimed that the activity was designed to make fun of hipsters(赶时髦的人), and call attention to the cultural atmosphere.

    Flash mob gatherings can sometimes shock people. Such an activity might seem amusing and untrue, but it also might frighten people who are not aware of what is taking place. Undoubtedly, flash mobs can serve as good political tools in any direction. They also have great economic potential, such as using flash mobs to advertise a product.

    The flash mob is now becoming more and more popular. People use it to do many things. For example, in 2009, Michael Jackson's fans took part in a flash mob to remember him. Hundreds of his fans gathered singing and dancing Michael's famous song “Beat It” together. Flash mobs give people from all walks of life an opportunity to come together to create a memory.

    I log onto a computer at the doctor's office to say I have arrived and then wait until a voice calls me into the examination room.

    There, a robotic nurse directs me onto a device and then takes my blood pressure. Some time later, in steps the doctor, who is also a robot. He notes down my symptoms and gives me a prescription (处方). I pay for my visit using a credit card machine and return home without having met another human being.

    When I call my dentist's office and actually get a human being on the line, I am thrilled. And when I see the introduction of yet more self-service checkout stations at the grocery store, I feel like shouting, “When it comes to cashiers, make mine human, please!”

    After all, human cashiers sometimes give you a store coupon (优惠券) for items you are buying. Even more than that, real-life cashiers often take an interest in particularly cute children, which can brighten a young mother's day. A cashier may also show compassion (同情) for an elderly person struggling to get that last penny out of her purse.

    What technological device would do any of this? I don't want to go back to the Stone Age, but I'm also worried about a world run by machines. Sometimes when you're chatting with someone, you discover things you need to know. Maybe a receptionist needs prayers said for a sick child. Maybe a salesperson can offer a bit of encouragement to a customer who is feeling tired.

Machines can be efficient and cost-effective and they often get the job done just fine. But they lack an element so important to everyday life.

    Call it the spirit, the soul or the heart. It is something no machine will ever have. It is being human that prompts us to smile at others, which may be what they need at that moment.

    Guide to four of the most exciting new adventure trips for 2017:

    Sahara

    Attractions: International Expeditions   Length: 18 days   Price: $13,998

Details: Remember the movie Ishtar? Now you, too, can spend days wandering in the desert, just like warren Beatty and Dustin Hoffman. Designed for rugged travelers, the camping expedition crosses1,500 miles of Niger's Sahara in four—wheel—drive vehicles.

    Departure Time: May 12     Information: 800-633-4731;  ietravel.com

    Across Patagonia: From the Andes to the Ocean

    Attractions: Boundless Journeys   Length: 10 days    Price: $8,995

    Details: The newest route across Patagonia starts high in the Argentine Andes and follows the Futaleufu River into Chile all the way to the Pacific Ocean. Travelers start by trekking along the river, changing to rafts before taking up kayaks for the final leg.

    Departure Time: March 5    Information: 800-941-8010; boundless, com.

Tribal(部落的)India

    Attractions: Myths and Mountains      Length: 17 days        Price: $17,530

    Details: For the travelers who have already visited the best-known India sites, this new trip visits a relatively unexplored state in central India ruled by the Vindhyachal Range and known for its wildlife, waterfalls, ancient sites and tribal culture.

    Departure Time(出发时间): Feb 17   Information: 800-670-6984; myths.com

    Dalmatian Coast Biking

    Attractions: Backroads            Length: 7 days           Price: $7,298

    Details: The company's first foray into Croatia follow scenic roadways across four islands between Dubrovnik and Spht.

    Departure Time: May 7    Information: 800-462-2848; backroads.com

    Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity (湿度).

In very cold climates, there is a constant danger of developing hypothermia, which is a life-threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0℃. However, differences in persons and even the time of day can cause it to be as much as 6℃ higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4℃. Below 29.4℃, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6℃. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7℃.

In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life-threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7℃. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.

Every profession or trade, every art, and every science has its technical vocabulary, the function of which is partly to name things, or processes which have no names in ordinary English, and partly to secure greater exactness in terminology (术语). Such special dialects are necessary in technical discussion of any kind. Being universally understood by those engaged or interested in the particular science or art, they have the accurateness of a mathematical formula (公式）. Besides，they save time in these kinds of discussions, for it is much more economical to name a process than to describe it. Thousands of these technical terms are very properly included in every large dictionary, yet, as a whole, they are rather in the suburbs of the English language.

Different occupations, however, differ widely in the character of their special vocabularies. In trades and handicrafts, and other professions, like farming and fishery, which have occupied great numbers of men from remote times, the technical vocabulary is very old. It consists largely of native words, or of borrowed words that have worked themselves into the very central part of our language. Thus, though highly technical in many particulars, these vocabularies are more familiar in sound, and more generally understood, than most other technical terms. In law, medicine, and philosophy, the special dialects have also become pretty familiar to cultivated persons and have contributed much to the popular vocabulary. Yet among these professions, each one still possesses a large body of technical terms that remain essentially foreign, even to educated speech. And the proportion has increased in the last fifty years, particularly in the various departments of natural and political science and in the mechanic arts. Here new terms are coined with the greatest freedom, and abandoned when they have served their turn. Most of the newly-invented terms are restricted to special discussions, and seldom get into general literature or conversation.

Yet no profession is nowadays, as all professions once were, a close combination. Lawyers, doctors and men of science all communicate freely with others, not in a merely professional way. Furthermore, what is called "popular science" makes everybody familiar with modem views and recent discoveries. Any important experiment, though made in a remote or provincial laboratory, is at once reported online, and everybody is soon talking about it-as in the case of AI.