Many people think of guys as being carefree when it comes to their appearance. But in fact, a lot of guys spend plenty of time in front of the mirror. {#blank#}1{#/blank#}.Body image is a person's opinions and feelings about his or her own body and physical appearance. {#blank#}2{#/blank#}. You appreciate your body for its capabilities and accept its imperfections.So, what can you do to develop a positive body image? Here are some ideas: Recognize your strengths. Different body types are good for different things. What does your body do well? Maybe your speed, strength, or coordination makes you better than others at a certain sport. That may be basketball, table tennis, mountain biking, dancing, or even running. Or perhaps you have non-sports skills, like drawing, painting, singing, playing a musical instrument, writing, or acting. {#blank#}3{#/blank#}. Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques (体形) don't just happen. {#blank#}4{#/blank#}. A healthy habit can be as simple as exercising 20 minutes to one hour three days a week. Working out can also lift your spirits. Respect your body! Practicing good habits — regular showering; taking care of your teeth, hair, and skin; wearing clean clothes, and so on —can help you build a positive body image. {#blank#}5{#/blank#}. Your body is just one part of who you are. Your talent for comedy, a quick wit (智慧), and all the other things make you unique. So try not to let small imperfections take over.

A. Use this as an opportunity to discover what you're good at.

B. Be yourself.

C. They care just as much as girls do about their body image.

D. Just explore talents that you feel good about.

E. They take hard work, regular workouts, and a healthy diet.

F. The good news is that self-image and body image can be changed.

G. Having a positive body image means feeling satisfied with the way you look.

    It's time to stop complaining. The economy might be melting down like butter in a hot pot, but for some people — you , maybe? — this could be a very good thing.

    Here's why. At no other time in recent history has it been easier or cheaper to start a new kind of company. Possibly a very profitable company. Let's call these start-ups LILOs, for “a little in, a lot out;” These are Web-based businesses that cost almost nothing to get off the ground yet can turn into great moneymakers.

    How do you get started? All that's required is a great idea for a product that will fill a need in the 21st century. These days you'd do best if your idea either makes people money or saves them money. And launching now will make your company stronger later — you'll learn to survive on fumes until the economy improves.

    That's what John Tayman is doing. He's an author who lives in San Francisco, where I met him; he wrote reviews for a business magazine I edited. Tayman knew little about technology and even less about business. And yet he dreamed of a website that would summarize car reviews from other sources and rank every model of new car. “It'll be like RottenTomatoes.com meets Kelley Blue Book,” he explained to me during lunch one day last June. Tayman said he intended to build the site on the side while continuing to write for a living. He'd work on his new company only at night and on weekends. Oh, yes, and he had only about $10,000. “Good luck with that!” I thought. Ideas are much easier to produce than they are to put into practice.

    Tayman went to work with nothing more than his PowerBook laptop. A very well-organized fellow, he quickly discovered a bunch of free stuff online — instructional manuals and sites that walk you through the process from start to finish. Within months, Tayman had a staff of 20 employees working for him in five different countries. MotorMouths.com went live in January. Tayman figures he has worked about 10 hours a week on it and hasn't spent a cent on marketing or advertising. Growth is modest but steady: nearly 10,000 people visit each week.

    Some materials are obtained from natural resources that are changed by chemical processes in a laboratory. The resulting artificial materials are synthetic, or human-made.

    Plastic is a synthetic substance, obtained from petroleum, a fossil fuel. The molecules（分子）in petroleum are split and then linked into chains. Plastic is an example of a polymer, a material made of repeating patterns of atoms linked together. Most polymers are synthetic. They are made by polymerization, the process of chemically linking many smaller molecules to form a larger molecule that has different physical features. Some polymers, such as proteins, occur naturally.

    Plastic is a key component of many products. When heated into an almost-liquid form, plastic can be made into fibers, sheets, or molds（模具）. It can be mixed with other elements to remain flexible, or it can harden into a solid. Plastic fibers can be made into clothing or carpeting. Sheets of plastic can be made into plates. Molded plastic can be sued for protective helmets or car bumpers.

    Most plastics can be reheated and remolded repeatedly. This feature makes plastic very easy to use. Polymers can be pulled into fine strings or molded into almost any kind of shape. For example, tubes of plastic can be shaped into bottles by different processes. One such process is extrusion blow-molding. Most plastics are also resistant to many chemicals that might harm other materials. This quality is the reason that so many cleaning liquids are packaged in plastic bottles.

    Plastics are good insulators that can stop electricity or heat to pass through. Look around your kitchen, and observe where plastics are used. Pot handles are sometimes made of plastic, as are cooking tools, toaster controls, and microwave cookware. Food-storage wraps and containers may be made of plastic. Take a walk outdoors, and note all the plastic items you see. Gardening tools, such as watering cans and sprayers, are often made of plastic. Swings and slides made of plastic do not become as hot as metal, so they are safer for play. Because plastics can be heated, remolded, and made into something else, they can be recycled and reused.

    Snoring(打鼾) is noisy breathing during sleep. It is a common problem among all ages and it influences about 90 million American adults. People most at risk are males and those who are overweight, but snoring is a problem of both genders, although it is possible that women do not present this complaint as frequently as men.

    Snoring is often the loud or harsh sound that can occur as you sleep. You snore when the flow of air makes the tissue in the back of your throat vibrate(颤动) as you breathe. The sound most often occurs as you breathe in air, and can come through the nose, mouth or both two organs. It can occur during any stage of sleep.

    About half of people snore at some point in their lives. Snoring is more common among men, though many women snore. It appears to run in families and becomes more common as you get older. About 40 percent of adult men and 24 percent of adult women are habitual snorers. Men become less likely to snore after the age of 70.

    Sleeping on your back may make you more likely to snore. You may snore when your throat or tongue muscles are relaxed. And substances(物质) that can relax these muscles may cause you to snore. These include alcohol, muscle relaxants and other medicine.

    Snoring can be a nuisance to your partner and anyone else nearby. You may even snore loudly enough to wake yourself up. Though, in many cases people do not realize that they snore. Snoring can also cause you to have a dry mouth when you wake up.

    Light snoring may not disrupt your overall sleep quality. Heavy snoring may be connected with a risk factor in the heart disease, stroke and many other health problems. So never take it lightly.

    China has been the birthplace of many of the world's greatest inventions. It was, for example, the first country to produce paper money. Before the invention of paper money and coins, people used many different kinds of things for buying and selling{#blank#}1{#/blank#}This exchange of goods and services for other goods and services is called bartering.

    {#blank#}2{#/blank#}In 1200 BC, people in China began to use shells (贝壳) as money. Usually the shells used as money were very small. This made it easier for people to carry money over long distances, and allowed for trade to develop between different parts of the country.

    In the years which followed this invention, many other countries around the world began to do the same.{#blank#}3{#/blank#}

    The next development was in 1000 BC, when China started making bronze and copper shells. It wasn't long before the Chinese made round coins out of metal.{#blank#}4{#/blank#}By 500 BC, metal coins had begun to appear in countries like Persia and Greece, and later in the Roman Empire.

    About 1,000 years later, leather was used as money in China, and in 806 AD, the first paper banknotes were produced by the Chinese people.{#blank#}5{#/blank#}

A. People also began collecting foreign coins as souvenirs.

B. During that time, for example, buying a chicken might cost several potatoes.

C. It was still many years before paper currency appeared in Europe.

D. However, as economies developed, such exchanges became impractical.

E. They also used tiny shells as money for buying and selling.

F. As time went by, trade between countries increased.

G. The first coins often had holes in them so that people could string them together.

Humans aren't the only animals that move to music. Parrots have been known to do it. And now rats have been observed bopping their heads in time with the tunes of Mozart, Lady Gaga, Michael Jackson and others, according to a new paper from the University of Tokyo. What's more, the rats seems to respond to the same beats that get humans' feet tapping (轻跺). 

The researchers played a sonata by Mozart for lab rats at different variations of the original speed. Wireless sensors on the rats' bodies tracked their movements. Meanwhile, 20 human participants were involved and listened to the same music through headphones equipped with motion sensors. 

It was observed that the rats' head movements were the most obvious when the music played at its normal speed, which was around 132bpm (beats per minute). The same was true for human participants. The researchers then changed to some pop songs such as Lady Gaga's "Born This Way" and Michael Jackson's "Beat It". As with Mozart's, rats moved their heads along the rhythm of pop songs, similar to how people do, at about 120 to 140bpm. 

The study showed that both rats and humans moved their heads along to the beat in a similar rhythm. The level of head bopping from both humans and rats decreased as the music sped up. The study suggests that there is something similar about the way human and rat brains respond to rhythms, but rats do not match their motions to the beat like humans do. Humans can predict the timing of a beat and move predictably to it. 

Aniruddh Patel, a psychologist who studies brain response to music, says humans and parrots respond to beats with big, voluntary movements such as head shaking, dancing or foot tapping. Patel also stresses that this study does not show that rats have the same emotional associations with music as humans do. Yet he believes it could help reveal how humans and some other animals developed a sense of rhythm.