Sleep is something we all do. But some people need to sleep more than others. Babies sleep most of the time. Children in school sleep about ten to twelve hours a night. Most adults sleep only seven or eight hours.{#blank#}1{#/blank#}All parts of our bodies have to rest after they work.. Our arms need a rest after we lift heavy thing, When we run fast, our legs work hard. They get tired. We have to rest them. Our brains workhard, too.{#blank#}2{#/blank#} We can sit quite still and rest our arms andlegs. But our brains aren't resting. They go right on thinking as long as weare awake.

      Our brains slow down a bit when we sleep and dream.{#blank#}3{#/blank#} Instead of thinking wide-awake thoughts, our brains make up dreams. Some dreams are very pleasing. Some are not. Most of thetime we forget them when we wake up.

      Scientists have tried to find out what would happen if people were not allowed to sleep. They asked some people not to go to bed. The people stayed up all night and all the next day. They stayed up the next night too,and the day after. They played games, but they made mistakes. They forgot things.{#blank#}4{#/blank#} The people grew rude and mean. They became angry with their friends. Finally they were too tired to stand up. When they sat down, they fell asleep.

Scientists have found that if people are not allowed to sleep and to dream, they act in an unusual way.{#blank#}5{#/blank#}But we do know that we need it to stay well. So tonight have a goodsleep. Lie down under the covers. Shut your eyes. Let your thoughts wander.Soon you'll stop thinking. You'll be asleep.

A. It was hard for their tired brains to work.

B. When we are awake, they help us pay attention to the worldaround us

C. But babies, children, and adults—all of us need to haveour sleep

D. Good sleep helps to improve one's memory

E. No one knows why sleep is so good for us

F. But even as we sleep our brains are doing some work

G. Of course you will have a good sleep

A

    Suppose you're in a rush, felling tired, not paying attention to your screen, and you send an email that could get you in trouble.

    Realisation will probably set in seconds after you've clicked “send”. You freeze in horrors and burn with shame.

    What to do? Here are four common email accidents, and how to recover.

    Clicking “send” too soon

    Don't waste your time trying to find out if the receivers has read it yet. Write another email as swiftly as you can and send it with a brief explaining that this is the correct version and the previous version should be ignored.

    Writing the wrong name

    The sooner you notice, the better. Respond quickly and briefly, apologizing for your mistake. Keep the tone measured: don't handle it too lightly, as people can be offered, especially if your error suggests a misunderstanding of their culture(i.e. incorrect ordering of Chinese names).

    Clicking “reply all” unintentionally

    You accidentally reveal(透露)to entire company what menu choices you would prefer at the staff Christmas dinner, or what holiday you'd like to take. In this instance, the best solution is to send a quick, light-hearted apology to explain your awkwardness. But it can quickly rise to something worse, when everyone starts hitting “reply all” to join in a long and unpleasant conversation. In this instance, step away from your keyboard to allow everyone to calm down.

    Sending an offensive message to its subject

    The most awkward email mistake is usually committed in anger. You write an unkind message about someone, intending to send it to a friend, but accidentally send it to the person you're discussing. In that case, ask to speak in person as soon as possible and say sorry. Explain your frustrations calmly and sensibly—see it as an opportunity to clear up any difficulties you may have with this person.

    Eyesight（视力) plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight：

    Schedule（安排）yearly exams(检查). {#blank#}1{#/blank#} Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eyeglasses.

    Protect against UV rays (紫外线). Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses. {#blank#}2{#/blank#}

    Give your eyes a break. Two-thirds of Americans spend up to seven hours a day using computers or other digital products. {#blank#}3{#/blank#} Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.

    {#blank#}4{#/blank#} As part of a healthy diet, eat more fruits and vegetables each day. Vitamins (维生素) C and E help protect eyesight and promote eye health.

    Practice safe wear and care of contact lenses (隐形眼镜). Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk. {#blank#}5{#/blank#} Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.

A．Eat your greens.

B．Eye care should begin early in life.

C．They can properly protect your eyes.

D．Stay in good shape by taking more vitamins.

E．Parents usually don't care about their own eyesight.

F．Always follow the doctor's advice for appropriate（适当的）wear.

G．This frequent eye activity increases the risk for eye tiredness.

    The kids in a village in Ethiopia wear dirty, ragged clothes. They sleep beside cows and sheep in huts made of sticks and mud. They have no school. Yet they all can chant the English alphabet, and some can make words.

    The key to their success: 20 tablet computers(平板电脑) dropped off in their Ethiopian village in February by a U.S. group called One Laptop Per Child.

The goal is to find out whether kids using today's new technology can teach themselves to read in places where there are no schools or teachers. The Massachusetts Institute of Technology researchers analyzing the project data say they're already amazed. “What I think has already happened is that the kids have already learned more than they would have in one year of kindergarten,” said Matt Keller, who runs the Ethiopia program.

    The fastest learner—and the first to turn on one of the tablets—is 8-year-old Kelbesa Negusse. The device's camera was disabled to save memory, yet within weeks Kelbesa had figured out its workings and made the camera work. He called himself a lion, a marker of accomplishment in Ethiopia.

With his tablet, Kelbasa rearranged the letters HSROE into one of the many English animal names he knows. Then he spelled words on his own. “Seven months ago he didn't know any English. That's unbelievable,” said Keller.

    The project aims to get kids to a stage called “deep reading,” where they can read to learn. It won't be in Amharic, Ethiopia's first language, but in English, which is widely seen as the ticket to higher paying jobs.

    If you work hard to have a positive attitude, you might be surprised by how much better you feel about yourself and life in general. {#blank#}1{#/blank#} The less stress you feel, the better you will feel generally. So if you've been feeling tired, think about the good, put on a happy face and you just might feel better soon.

    But how can you have a positive attitude when life is hard? It's more than just turning life's lemons into lemonade. {#blank#}2{#/blank#} But it's worth it. Here are some ways you can develop and maintain(保持)a positive attitude even in the midst of life's troubles.

    {#blank#}3{#/blank#}It just means being an optimist and looking for the good in things, rather than being a pessimist(悲观者) and focusing on the bad in things. Sometimes your view can make all the difference in the world.

    Identify(确认) those areas of your life that might not be going so well. {#blank#}4{#/blank#} Focus on one area at a time and think of ways you can find the positive in them.

    Smile and laugh! Yes, it can be that simple. Learn to love life, no matter what's going on. Smile at others and they will smile back at you.{#blank#}5{#/blank#}Sometimes laughter really is the best medicine.

    Exercise！Get off the couch and get moving. Being active and healthy can give you a completely different attitude to life.

A. Have fun and find the humor in life.

B. You may find it hard to stay positive in your life.

C. Having a positive attitude can take some hard work.

D. A positive attitude doesn't mean taking no notice of life's troubles.

E. Having a positive attitude can also reduce your stress level.

F. These are the areas likely to make you think negative thoughts.

G. Go to bed earlier so you get the sleep you need to feel positive.

    The older we get, the more we learn, the better able we are to know what's right. Right? Not always. Sometimes the aging process can remove completely the natural aspects that keep us curious and give us strength to figure out what to do. As a matter of fact，children of all ages teach us lessons in our own lives.

    When a kid says“ That wasn't nice 'or' I don't like your shirt” or “I hate that kind of food!”, it's a natural reaction(反应)to shush the child not to do so, but what they say is true. When children see a wrong being done, they will interrupt to say it's not right. As adults, we usually sit nearby rather than hold a strong opinion or say something that might be unpopular.

    Kids cry, stamp( 跺) their feet or yell with excitement while it isn't socially acceptable for an adult. Letting emotions out and then moving on to deal with things, so jump and yell "yippee" when you are happy about something. Have a good cry when being upset. Stamp or throw a pillow when being alone and need to release. Most of life becomes a series of things once you reach a certain age. Finding pleasure and laughing seems out of place or silly when gaining knowledge or skills.

    “Why is the sky blue?” “ How much does an elephant weigh?” There are certain things that the Internet can tell you, but what about learning something in the first hand like the science experiment in the kitchen, digging up rocks in the backyard, how high the bicycle's wheels can fly over the gravel( 砂砾)? Don't stop exploring and find new learnings in the real world.