For many people, history classes are seen as no more than requirements for getting degrees in chemistry, biology, business, marketing, etc. {#blank#}1{#/blank#}． Below are a few reasons why it's vital that today's people continue to learn about the past.

    Understanding where people come from plays a key role in understanding who they are.{#blank#}2{#/blank#} For this reason, it's extremely important to learn history in order to understand why people are the way that they are.   

    Through history classes, you can experience a shift (改革) in the way you think. {#blank#}3{#/blank#}It's important to develop minds to be able to consider problems from different angles. Finally, this shift can improve your ability to analyze and understand situations, to make educated decisions and to learn how to weigh the consequences related to each choice before you.

    {#blank#}4{#/blank#}The idea that history repeats itself is rooted in truth. From wars to fashion to political trends, historians are often able to make predictions about the future based upon the past. By having a deep understanding of what happened in the past, today's people can better prepare for brighter futures by making the right decisions—instead of repeating old mistakes.

    Many people may not believe that a degree in history can lead to a well-paid job. In fact, students who graduate with degrees in history can become lawyers, business owners, think tank members, educators, leaders in historical organizations writers and so on. {#blank#}5{#/blank#}.

How to Be Confident

    We are all human and have weaknesses. Even if your physical appearance or social skills aren't what you wish they were, that doesn't have to stop you from being confident. {#blank#}1{#/blank#}

    *Make a list of special talents you have, or things you do that are good—morally（道德上） or otherwise. It doesn't have to be a specific skill；it can be an approach or an attitude that you hold through life. {#blank#}2{#/blank#} Are you very patient with people? Do you always see the humorous side of things? Are you always there for your friends?

    {#blank#}3{#/blank#} When you feel strongly about something, speak loudly and clearly and make eye contact with people. People will judge you all the time, and usually they'll misjudge you anyway, so why bother trying to live up to their opinions at all?

    *Take care of yourself. Eat a healthy diet and get enough exercise. Don't abuse your body, don't overload it, and don't deny it any of the things it needs. At the same time, don't obsess(沉迷). {#blank#}4{#/blank#} Those things are only band-aids(权宜之计） and make-up. Confidence comes from within. In order to be confident, you must value yourself and understand that your well-being is important.

    *Improve your posture. {#blank#}5{#/blank#} Don't drop your shoulders. Make sure that your back is straight, your shoulders are square, and your chest sticks out slightly (but stay loose, otherwise you'll appear stubborn （固执的）and nervous). Good posture also helps with deep breathing, which helps with feeling calm and relaxed.

    Do you know Australia? Australia is the largest island in the world. It is a little smaller than China. It is in the south of the earth. {#blank#}1{#/blank#}The population of Australia is nearly as large as that of Shanghai. The cities in Australia have got little air or water pollution. {#blank#}2{#/blank#} You can clearly see fish swimming in the rivers. Plants grow very well.

    Last month we visited Perth, the biggest city in Western Australia, and went to a wild flowers' exhibition. There we saw a large number of wild flowers we had never seen before. We had a wonderful time. {#blank#}3{#/blank#} In spring every year Perth has the wild flowers' exhibition.

    After visiting Perth, we spent the day in the countryside. We sat down and had a rest near a path at the foot of a hill. {#blank#}4{#/blank#} Suddenly we heard bells ringing at the top of the hill. What we saw made us pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep coming towards us down the path. {#blank#}5{#/blank#} After a short drive from any town, you will find yourself in the middle of white sheep. Sheep, sheep, everywhere are sheep.

A. The people of Australia are very hard-working.

B. Australia is the sixth largest country in the world.

C. Australia is famous for its sheep and kangaroos.

D. Australia is big, but its population is not large.

E. Perth is famous for its beautiful wild flowers.

F. The sky is blue and the water is clean.

G. It was quiet and we enjoyed ourselves.

    It's becoming more and more common for people to live to 100 or longer. In fact, researchers say that more than a third of all babies now born in wealthy nations are likely to reach their 100^th birthdays, thanks to advanced medical technology and treatment. Here are some of the best strategies for becoming a centenarian.

    Eat vegetables and nuts. A study found that those who ate mainly vegetables gained an extra year and a half over meat-eaters; those who ate nuts regularly lived two years longer.

    Make friends. Another study found that people with strong social networks were 50 percent less likely to die over a certain period. If you don't have many friends or relatives in your local community, you can join in the voluntary activities or take part in a hobby group. You will stay happy and healthy through building the connections.

    Don't smoke. This is important: With occasional exceptions, smokers die younger than non-smokers. Even if you have had the habit for decades, quitting will help with your health greatly. It's important to get your loved ones to stop it, too. People who breathed in secondhand smoke were 26 percent more likely to get heart disease than those who rarely stayed with smokers.

    Improve your lifestyle. Along with healthy eating, you should focus on stress management, regular exercise, and building healthy relationships. When you eat more healthily, manage stress, exercise and love more, your brain actually gets more blood flow and more oxygen.

    Have a sense of purpose. A study found that the common feature in communities with many people who are 100 or older was that older people still took part in daily life, through tasks such as cooking, cleaning and gardening. They feel the motivation(动机) to stay active, to get out of bed in the morning and live for a purpose.

    Every animal sleeps, but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month.{#blank#}1{#/blank#}

    One idea is that sleep helps us strengthen new memories. {#blank#}2{#/blank#} We know that, while awake, fresh memories are recorded by reinforcing (加强) connections between brain cells, but the memory processes that take place while we sleep have been unclear.

    Support is growing for a theory that sleep evolved so that connections between neurons (神经元) in the brain can be weakened overnight, making room for fresh memories to form the next day.{#blank#}3{#/blank#}

    Now we have the most direct evidence yet that he is right.{#blank#}4{#/blank#} The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.

    If Tononi's theory is right, it would explain why, when we miss a night's, we find it harder the next day to concentrate and learn new information — our brains may have smaller room for new experiences.

    Their research also suggests how we may build lasting memories over time even though the synapses become thinner. The team discovered that some synapses seem to be protected and stayed the same size. {#blank#}5{#/blank#} “You keep what matters,” Tononi says.

A. We should also try to sleep well the night before.

B. It's as if the brain is preserving its most important memories.

C. That's why students do better in tests if they get a chance to sleep after learning.

D. Similarly, when people go for a few days without sleeping, they get sick.

E. The processes take place to stop our brains becoming loaded with memories.

F. Tononi's team measured the size of these connections, or synapses, in the brains of 12 mice.

G. “Sleep is the price we pay for learning,” says Giulio Tononi, who developed the idea.

    {#blank#}1{#/blank#} According to a new survey by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7- to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.

    {#blank#}2{#/blank#} Babies need a lot of rest: most of them sleep about 18 hours a day! Adults need about eight hours. For most school-age children, ten hours is ideal. But the new National Sleep Foundation survey found that 35% of 10- to 12-year-olds get only seven or eight hours. And guess what almost half of the surveyed kids said they do before bedtime? Watch TV.

    "More children are going to bed with TVs on, and there are more opportunities to stay awake, with more homework, the Internet and the phone," says Dr. Mary Carskadon, a sleep researcher at Brown University Medical School. She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep. {#blank#}3{#/blank#} Changing levels of body chemicals called hormones not only make teenagers' bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

    Because sleepiness is such a problem for teenagers, some school districts have decided to start high school classes later than they used to. {#blank#}4{#/blank#} Students parents and teachers are pleased with the results.

A. How much sleep you need depends a lot on your age.

B. Other experts say part of the problem is chemical.

C. Getting less sleep has become a bad habit for most American kids.

D. what homework waiting for kids might always affects them sleep well every night.

E. Raising the minimum sleep is identified as a key way to help solve the problem.

F. Three years ago, schools in Edina, Minnesota, changed the start time from 7:25 am to 8:30 am.