How teens can stay fit

    Any type of regular, physical activity can improve your fitness and your health.{#blank#}1{#/blank#}

    Exercise should be a regular part of your day, like brushing your teeth, eating and sleeping. It can be in gym class, joining a sports team, or working out on your own. Keep the following tips in mind:

    {#blank#}2{#/blank#} A good attitude is important. Find an activity that you think is fun. You are more likely to stick with it if you choose something you like. A lot of people find it's more fun to exercise with someone else, so see if you can find a friend or family member to be active with you.

    Take it one step at a time.{#blank#}3{#/blank#} For example, walk or ride your bike to school. Get on or off the bus several blocks away and walk the rest of the way. Use the stairs instead of taking the elevator.

    Get your heart pumping. Whatever you choose, make sure it includes aerobic (有氧的) activity that makes you breathe harder and increases your heart rate. This is the best type of exercise because it increases your fitness level and makes your heart work better.{#blank#}4{#/blank#} Examples of aerobic activities are basketball, running, or swimming.

    Don't forget to warm up with some easy exercises or stretching (拉伸) before you do any physical activity. {#blank#}5{#/blank#} It is also important to stretch out after you exercise to cool down your muscles.

A. Do the activity as often as possible, but don't exercise to the point of pain.

B. The most important thing is that you keep moving!

C. Make physical activity a habit.

D. Small changes can add up to better fitness.

E. Stay positive and have fun.

F. This warms your muscles up and may help protect against injury.

G. It also burns off body fat.

    Tiny as they are, bats have the ability to “see” in the dark by using a special skill called echolocation(回声定位法). They make noises and wait for sound waves, or an echo, to bounce(反弹) back off objects. They can tell the distance of various objects by how quickly the sound waves bounce back off them. If no sound bounces back, they can then fly forward.

    This special ability has been simulated in the human world for a long time, such as in submarines and planes, whose sonar(声呐) systems are somewhat similar to echolocation. But apart from helping vehicles “see” where they are, what if blind people could use echolocation for themselves? It turns out, some already are.

    American Daniel Kish, who is blind, is known as “Batman”. This isn't because he walks around in a cape and a mask, but because he has a bat-like ability to locate where he is through sharp clicks he makes by moving his tongue against the roof of his mouth. Kish is so skilled at echolocating that he can ride a bike and hike on his own.

    Recently, research carried out at the University of Durham in England shed some light on the power of human echolocation.

    Kish worked with a group of scientists who studied the way blind people listen to the echoes that they produce from clicks.

    The team, which conducted experiments with other volunteers, found that people were capable of hearing even very faint echoes, ones far fainter than had been previously thought.

    Speaking to The Independent, Lore Thaler, lead scientist of the group, said, “We found that in some conditions, they were really faint – about 95 percent softer than the actual clicks, but the echolocators were still able to sense this.”

    Andrew Kolarik of the University of Cambridge is another expert in echolocation. Reacting to the Durham study, he told BBC News that echolocation “can be very useful at providing information at face or chest height” and could help people “avoid objects like low hanging branches that might not get detected by the cane or a guide dog”.

    Although Kish's skill is remarkable, there's hope for other blind people who want to use echolocation. According to BBC News, echolocation is a skill blind people can acquire and develop, just like learning a language. As Kolarik said: “Teaching echolocation skills could provide blind people with the means of exploring new places.”

    How do you get a man to do his share of the housework? If you are like most women, you've faced this question the hard way.

    A man will enjoy a clean, orderly house, but he usually won't make the effort to clean or organise it. This doesn't mean that a woman has to do all the housework; she may have to manage many of the household duties, and request her partner's participation(参与). A woman can often say that men and women should take equal responsibility(责任) for housework.

    Very few men are raised to be fully responsible for housework, and many men look on housework as women's work. On the other hand, most men will readily work around the yard, make repairs and complete projects on weekends or evenings, and it's important that you give your man appreciation(欣赏) for those things, too. Most men will take on a little housework around the house if asked politely. They are even more likely to do housework if they can choose what they want to do, and do it without being monitored(监视).

    Here's the key: men want to feel that they are doing housework either because they want to do a task, or because they simply want to please their women. Men are much less likely to take on household tasks they consider uninteresting and unimportant. In other words, men are likely to do a household task just for the good of the house.

    TED is a non-profit organization devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, and Design. Since then it has stepped into more and more fields. It includes two annual ( 年度的) conferences-the TED Conference on the North American West Coast each spring, and the TED Global Conference in Edinburgh UK each summer, which bring together the world's most excellent thinkers and doers, who are challenged to give the talk of their lives ( in 18 minutes or less).

    On ted.com, we make the best talks and performances from TED and partners available to the world, for free. More than 1, 200 TED talks are now available,' with more added each week, which cover almost all topics from science to business to global issues- in more than 110 languages. They really help share ideas in communities around the world.

    We believe in the power of ideas to change attitudes, lives and eventually, the world. So we' re building here a clearinghouse (信息交流中心 ) that offers free knowledge and inspiration from the world's most inspired thinkers, and also a community of curious souls to engage with ideas and each other. Have an idea? We want to hear from you.

    Today, TED is best thought of as a global community. It's a community welcoming people from every field and culture who seek a deeper understanding of the world.

    Want to follow TED? Here are the ways to connect:

    Get TED news and conference coverage ( 新闻报道) on the TED Blog.

    Follow TED on Twitter:

    @TED News for all TED news and information

    @TED Talks for daily TED Talk release only

    See photos from TED events on Flicker.

    A friend is better than fortune. A friend is worse than poison in some cases.

    The two sentences above have opposite meanings and seem to be unreasonable  but they can be explained as follows: the first refers to all good friends who drive us towards good while the second all bad ones who lead us into bad ways.

    My ideal friend is of course a good friend whose goodness is shown below — he has no bad habits  such as smoking and drinking. He lives in frugality (节俭). He studies hard so as not to waste his golden time. At home he honors his parents and loves his brothers; at school he respects his teachers and shares the feelings of his classmates. He treats those truly who are true to him. In a word, he has all the good characteristics that I don't have. I can follow him as a model. With his help I can be free from all difficulties.

    Indeed, if I have such a person as my friend, I shall never fear difficulty and I shall never know the existence of the word "failure".

    We often spend a lot of time complaining about the things we don't have or thinking about the things we want to have in future, and forget those things we have now. {#blank#}1{#/blank#}. One of the best ways is to make a list of all the things you are grateful for.

    Having a comfortable family

    Even if you have a difficult relationship with your parents, you should be thankful to your family. Whether you come from a small quiet family or a big noisy one, remember that these people truly love you, even if they don't show it.{#blank#}2{#/blank#}.

Having a good relationship with friends

    {#blank#}3{#/blank#}, be grateful for having them, even if you have only one. Personally I can say that one good friend is always better than a few so-called friends. Be thankful to your friends and try to remind them how much you care as often as possible.

    {#blank#}4{#/blank#}.

    We often forget our health until we are sick. Whether you have a headache or something more serious, you can't accomplish your tasks and you can't focus on anything else. If you are a healthy person，be thankful for it each day, and make sure you lead a healthy lifestyle.

    Valuing the past failures and mistakes

    Every person should be grateful for their failures and mistakes. Every failed relationship or missed job chance makes you a better person. {#blank#}5{#/blank#}. Just don't dwell(细想)too much on your past.

A. Keeping your body in a good situation

B. No matter how many friends you have

C. Realizing the condition of your sickness

D. They will always be ready to help you in any situation

E. When your friends point out your past failures and mistakes

F. If you fell down, you should remind yourself that you are actually a happy person

G. Sometimes mistakes are great since they help you become better if you learn from them