There are some injuries that are common to all types of extreme sports. The following are some of the important things to do to prevent extreme sports injuries. {#blank#}1{#/blank#} But they can definitely minimize the risk of injuries.

    Warm up.

    {#blank#}2{#/blank#} They include a combination of cardiovascular(心脏血管的)exercises, strength drills and stretching. Cardiovascular exercises increase body temperature, heart rate and blood circulation, which is required for further movement of the body. Strength drills increase the stamina of the body, while stretching warms up the muscles preparing them for sudden forceful movements. {#blank#}3{#/blank#} It also plays an important role in boosting the team spirit for a team sport. A warm-up session should last for at least 20 minutes and it can extend up to half an hour.

    Avoid overworking.

    There are some people who do not exercise their body for the sport on a regular basis and perform a week's task in a day or two. {#blank#}4{#/blank#} They do not realize the effect of overworking during the performance and keep doing it until they feel extremely tired. Apart from the actual sport, one should also avoid overdoing the warm-up exercises before the activity.

    {#blank#}5{#/blank#}

    Just as warming up is essential before any rigorous(充满活力的) physical activity, cooling down the body after playing a rigorous sport is also a significant part of physical conditioning. When you are done with your sports session, you can conclude with some walking, jogging or light running. Slight stretching exercises, focusing on specific muscles, will also be useful for cooling down the body.

A. Cool yourself down.

B. Look for a coach to train you.

C. These people are likely to suffer from extreme sport injuries.

D. However, there are no perfect methods which can assure you 100% safety.

E. Along with physical preparation, warming up prepares you mentally to begin a sport.

F. You should also be careful about your clothing selection for warmth and protection.

G. Warm-up exercises are very important before you begin any sports practice.

    In one of the old buildings near our school,one could see an old man sitting by a large window on the first floor,His name was James.During the three years at school,I had hardly ever found him missing from his usual position.

He was a high-ranking government official and lived happily with his wife .Once there was a bus accident,in which a number of passengers were seriously injured and taken to the hospital for treatment.James was responsible for the rescue operation.It was a big hospital,but James was shocked to notice how ill-equipped it was.There was no enough life-saving drugs and life-supporting equipment.The injured and their companions had to struggle there .James attempted to help .However,though he emptied his pockets,many of them died that day.

That was a turning point in his life.He made a decision to devote his life to helping others,particularly the poor and needy patients and their companions.He began to spend much of his income on these people.Since this required much time and energy,he found it difficult to fulfill his official duties and therefore chose to retire,which,in turn,reduced his income considerably.

His wife was deeply worried.Most of the time,James was out and paid least attention to home affairs.Meanwhile,as he was spending a lot helping others,she had struggle even to meet the household expenses.Though she was not against his helping the poor,she urged him not to ignore his own home and life,but it had no effect on him.She decided to leave him ,never to return.Though he continued his work, this was a great blow and did serious harm to his health and enthusiasm and he was soon forced to stay indoors.That was when he took his position by the window,spending his time looking outside.

    A few weeks after my graduation,I returned to school,only to find the building gone.I heard that they were torn down.Everyone left except James.He refused to go and the next morning,he was found at his usual place by the window,dead.

    "Some secrets are hidden from health," wrote John Updike in his poem "Fever".

    I have experienced the truth of Updike's observation. My excellent health kept me from seeing some things—things that became secrets of sort.

    One relates to my son Chris. When I lost my health in March, I discovered something I had missed about him.

    Christopher has been a scholar and athlete through high school. He has behaved responsibly, engaged in community service. He has had an impressive peer group of  serious students.

    While I saw these things, I had missed before what I experienced while in hospital. Early on, Christopher offered the clearest and most forceful words about my need to be positive and to fight acute leukemia(急性白血病). He never left the room after a visit without making me promise that I would be mentally tough and positive.

    During the first week, he showed his own mental toughness, researching leukemia and learning what the chances were. He even stopped my doctor outside the room, introduced himself and asked directly what he thought of my chances. He processed the answer without overreaction.

    Christopher did admonish(劝告) me against my choice of words the first week at home. I had moved back into my room from weighing myself, discovering a thin figure I did not know. I announced to him and my wife, “dead man walking”. I thought it was a way to lighten the obvious. He saw it as negativity and was strongly against such thinking and talking.

    When I resisted taking medicine sometimes, Christopher formed a “good-cop-bad-cop” team with his mother. Betsy gently and patiently encouraged. He directly and forcefully insisted. He always made the logical arguments for why I needed to take some awful pills.

    My health had hidden something from me; my ill-health helped me to see it.

    Have you ever made your life look a little more charming than it actually is by posting truths on social media? If so, you may be damaging your mental health.

    The posts we make on social media platforms allow us to look back and see what we did on a given day. But what happens when, in an effort to impress our online friends, photos and videos we post become beautified versions of the things we did?

    A young girl named Sophia went out to a romantic anniversary dinner with her boyfriend, had a near relationship-ending fight during dessert, then came home and posted, "Had the best time out with the love of my life!"—even with a photo of the meal. No surprise, but according to a new study, Sophia was by no means unique. Two-thirds of users admit lying about their lives on social media with 20 percent of young people between the ages of 18 and 24 stating that they edit their own stories by frequently lying about relationships and promotions.

    By beautifying our online stories, we are harming our memories. We start believing the stories we tell rather than remembering what really happened. Soon, the real experience is lost and all that remains is the beautified version of history.

    Scientists fear that these edited stories will end up changing our memories. It's well confirmed through research that our own memories are often unreliable and can be easily controlled. Writing down one's life in the form of a journal, or even on social media can help us keep our memories undamaged, but only if we tell the truth. So recording our experiences through whatever medium, to later recall lessons we learned, is not only acceptable but desirable. In fact, looking back at our own past—however embarrassing or uncomfortable - is not just healthy but can be enjoyable.

    Universities and colleges in the United States are trying new programs for international students to increase enrollment and income. Some universities are experimenting with bringing international high school students to their campuses. These programs permit students to complete their high school diploma while earning college credit at the same time.

    One example of this model is at the University of Southern Maine, or USM. The program is called the "International Academy". The school is expecting its first class of international high school students this fall. Joanna Evans is the director for the academy. The program is officially a "boarding school on a university campus" that serves 11th and 12th grade international high school students only.

    The students will take classes at the University of Southern Maine to complete their high school diploma. However, because the classes are university-level, the students will receive college credit at the same time.

    According to Evans, the students they admit will have to be very strong. Their course schedule will be the same as taking only advanced-placement courses. The goal is that, by the time they complete their high school diploma at the academy, they will be ready to start college as a third-year college student.

    Their English language skills also must be strong. The Academy looks for students with a minimum Test of English as a Foreign Language, or TOEFL score of 79,or a 6.5 on the International English Testing System, or EELTS. However, there are classes available to provide additional English language training when the students arrive if they need it.

    All incoming students at the academy are required to take a college writing class in their first term. If English is not their first language, they will take a class taught by teachers with a background in teaching students who speak English as a foreign language.

    Although they are only high school students, the expectations are the same as college students. "Students need to be ready to take university classes, and that is the deal" Evans said.

    (CNN)—This photograph of two men sharing a drink 30 meters below the water is part of an art project exploring the mysterious world of freediving—a form of underwater diving that relies on a diver's ability to hold his or her breath until resurfacing rather than on the use of oxygen tanks (氧气瓶).

    Each man, dressed in shirt, jeans and sunglasses, sits in a chair at the bottom of the Caribbean Sea with local sharks—harmless to humans—swimming just meters away. Of course, these aren't ordinary men, but freedivers: extreme athletes who dive on a single breath of air.

    American photographer Lia Barrett had been taking pictures of brave divers competing at the Caribbean Cup off the coast of Honduras, when she decided to create a fantastic underwater world in which humans go about everyday tasks—such as drinking coffee or riding bikes.

    "After the competitors had a great time in the new national and world records set at the competition, I took advantage of their breath-holding skills to do photo shoots I had only dreamed of before," said the 29-year-old.

    Perhaps unsurprisingly, Barrett is often asked whether the amazing pictures are Photoshopped. She laughs quietly as she insists they're 100% real.

    The picture of two men having coffee took 50 minutes to create, with the men receiving oxygen from standby assistants around every three minutes.

    "On the way back up, we were holding onto the table during our decompression (减压) stop in the strong current (水流)—it was quite a scene."

    The underwater models made an 11-minute stop on the way back to the surface, making sure they didn't rise too quickly and suffer decompression sickness—which can cause deadly blackouts (眩晕).