Polar bears are suffering in a {#blank#}1{#/blank#} (warm) world.

    Polar bears live in environments too cold for most animals. {#blank#}2{#/blank#} much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared {#blank#}3{#/blank#} for the cold conditions. But nothing has prepared the bears for the danger that {#blank#}4{#/blank#} (threat)the only home they know.

    The polar bears' world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years {#blank#}5{#/blank#} 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their {#blank#}6{#/blank#}． (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, {#blank#}7{#/blank#} scientist who studies North American polar bear populations. “{#blank#}8{#/blank#}  it, they can't exist.”

    Some melting and refreezing of the polar ice is natural. {#blank#}9{#/blank#} in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, {#blank#}10{#/blank#} the bears are not actively hunting.

    Marry of us wake up feeling{#blank#}1{#/blank#}(tire) in the morning. Many of us ignore the problem as the day goes on,{#blank#}2{#/blank#} (forget) that it might have a{#blank#}3{#/blank#}(danger) effect. Society even glorifies “burning the candle at both ends” as{#blank#}4{#/blank#}sign of our devotion to work and family.

    Believe it{#blank#}5{#/blank#}not, all this bad sleep has far-reaching consequences. We just do not give ourselves enough chances to sleep. A survey of over 74,000 people found 35 percent reported sleeping less than seven hours daily{#blank#}6{#/blank#}average. Furthermore, the amount of sleep{#blank#}7{#/blank#}(change) greatly over the past 15 years.

    This lack of sleep can lead of many serious{#blank#}8{#/blank#}(problem). One study found that{#blank#}9{#/blank#}(simple) limiting yourself to six hours of sleep a night for two weeks had similar effects to staying up all night the night before,{#blank#}10{#/blank#}could make you perform poorly on a timed attention task.

    All through high school, I {#blank#}1{#/blank#}(play) football, basketball, and soccer, and I was on the track team. But boxing was the sport that I liked {#blank#}2{#/blank#} (much) because It's more {#blank#}3{#/blank#}(challenge)and exciting to me. I found that I enjoyed the Anil of the one-on-one competition. I also liked the feet that it was up to me {#blank#}4{#/blank#} I won or lost – that I was the determining factor. I think I've always been a competitor, and winning would give me {#blank#}5{#/blank#} (satisfy) and a good feeling about myself. I wanted to win every time.

    I started training with Bruce who got me into the boxing. With Bruce {#blank#}6{#/blank#} (act) as my boxing coach, friend, mentor, and a father figure for me {#blank#}7{#/blank#}(look) up to, I learned that boxing is a sweet science{#blank#}8{#/blank#}I could use my brain as well as my strength and size. I used my ability to focus under pressure. {#blank#}9{#/blank#} (train) for several years, I went from being a street fighter {#blank#}10{#/blank#}a gold medal-winning Olympic champion.

    Two years ago, Jo acted as a teacher in Papua New Guinea. There was no electricity, water or textbooks in the school. When she knew that the students {#blank#}1{#/blank#} (die) to learn chemistry, she tried to show {#blank#}2{#/blank#} (they) chemistry experiments every week. Sometimes, she doubted whether chemistry was relevant{#blank#}3{#/blank#} these students, because most of them would go back to their villages. Actually, they had no{#blank#}4{#/blank#} (person) ambition. The local people had a hard life. Their hut was so dark that it took time for one's eyes {#blank#}5{#/blank#} (adjust). The only possessions {#blank#}6{#/blank#} could be seen were one broom, a few tin plates and cups and a couple of jars. They didn't speak much of the local English dialect. When {#blank#}7{#/blank#} (sit) around, she loved listening to them softly talking to each other in their language{#blank#}8{#/blank#} (occupy) with teaching, she had no time for social{#blank#}9{#/blank#} (activity). Instead, she often joined in their family party. She felt it was {#blank#}10{#/blank#} privilege to spend a day with them.

    Bank of China and Alibaba are the dream employers for Chinese students, according to a new survey.

    The survey of more than 55,000 students, {#blank#}1{#/blank#}(conduct) by a research firm Universum, found that {#blank#}2{#/blank#}(rough)a quarter want to work for an international company, while only 9% want to work for a start-up. Five percent want to start {#blank#}3{#/blank#}own business.

    When it comes to desirable companies, business students{#blank#}4{#/blank#}(name)Bank of China the top choice for seven years, and it shows no signs of {#blank#}5{#/blank#}(give)up its lead.

    William Wu, manager of Universum, said that banking remains{#blank#}6{#/blank#}attractive industry for young Chinese. “China's government is now emphasizing the revolution of finance industry, {#blank#}7{#/blank#}leaves the younger generation with the impression that though banking is a {#blank#}8{#/blank#}(tradition)industry, there are still a lot of development {#blank#}9{#/blank#}(opportunity),” Wu said.

    Alibaba improved six places from 2014, {#blank#}10{#/blank#}(rank)second among business students. It held a record-breaking $25 billion IPO in September.

    We want our children to succeed in school and, perhaps even more importantly, in life. But the paradox(悖论) is that our children can only truly succeed {#blank#}1{#/blank#} they first learn how to fail. Consider the finding that world-class figure skaters fall over more often in practice than low-level figure skaters. Why are the really good skaters falling over the most?

    The reason is actually quite simple. Top skaters are constantly challenging themselves in practice. {#blank#}2{#/blank#} (stretch) their limitations, they keep trying their best. They fall over so often, but it is precisely why they learn so fast. Lower-level skaters have a quite different approach. They are always attempting jumps they can already do very easily, {#blank#}3{#/blank#} (remain) within their comfort zone. This is why they don't fall over. In a superficial sense, they look successful, because they are always on their feet. Never {#blank#}4{#/blank#} (fail) in practice prevents them from making progress.

    {#blank#}5{#/blank#} is true of skating is also true of life. James Dyson worked through 5,126 prototypes (原型) for his newest vacuum before coming up with the design {#blank#}6{#/blank#} made his fortune. These failures were essential to the pathway of learning. As Dyson put {#blank#}7{#/blank#}: "You can't develop new technology unless you test new ideas and learn when things go wrong. Failure is essential to invention."

    In healthcare, however, things are very different. Clinicians don't like to admit to failure, partly because they have strongegos (自我) —particularly the senior doctors—and partly because they fear litigation (诉讼). The consequence is that {#blank#}8{#/blank#} learning from failure, healthcare often covers up failure. The direct consequence is that the same mistakes {#blank#}9{#/blank#} (repeat). According to the Journal of Patient Safety, 400,000 people die every year in American hospitals alone due to preventable error. {#blank#}10{#/blank#} healthcare learns to respond positively to failure, things will not improve.