Haiyan is 7 years old. Her parents gave her an iPad as a gift for her birthday. A month later，her eyesight（视力）dropped to 300 degrees. This is serious for such a young child.

    Many children in China are facing the same problem: iPad using is bringing problems to their eyesight. The problem is so common that newspapers even call the iPad the "No. 1 killer of children's eyesight!"

    "There are about 30 shortsighted children coming every day, "said Hu Dali, an eye doctor at Guiyang Aier Eye Hospital. "Half of those children have poor eyesight because they have played with phones and iPads for too long. "

    Doctors and scientists say children's vision（视觉）is not yet fully developed and their eyes get tired more easily. The screen of an iPad uses very bright（明亮的）LED backlight. If children look at an iPad screen for a long time, their eyes do not have time to rest. This will make their eyesight worse over time.

    Doctors advise that users should hold their iPads between 40-60 centimeters（厘米）away from them. The brightness of the screen should be comfortable for children. Parents should also stop their children from using an iPad for more than one hour every day.

    Young children don't have the skills or knowledge to stay safe in heavy traffic. The following tips (忠告) will be helpful for you to keep your children safe in heavy traffic. {#blank#}1{#/blank#} As parents, make sure that you always set good examples. Your children will follow you and think it's OK to do like you. Teach your children to pay attention to traffic lights {#blank#}2{#/blank#} This helps them understand when it's safe to cross. Make sure that you walk between your children and the traffic, and hold their hands all the time.

    {#blank#}3{#/blank#} you can start to tell them the importance of traffic knowledge. Let them start to understand the reasons why they need to be so careful. Talk with them about road signs and traffic rules.

    Ask your children to play in a safe place. Never let them ride bikes on the road without an adult present at rush hour.

    The most important thing you can do is {#blank#}4{#/blank#} so parents encourage them to follow traffic rules. {#blank#}5{#/blank#} they'll volunteer to obey them. In this way, they'll be careful enough to keep themselves away from danger.

Have you ever had lucid (清醒的) dreams? Recent studies suggest that the number of people having them is on the rise. Someone having a lucid dream realizes they are dreaming and may from then on" direct" the action, or they may simply " watch" the dream unfold. The sense of awareness (知道) makes it different from a dream that is simply very lively and true to life. And although the description may seem strange, the process is far from alien to many of us.

Studies suggest that the number of people in the Western world experiencing lucid dreams, which happen once in a while, has risen by between 10 and 40 per cent since the 1980s. Today, they are so common that about one in eight of us will have one in our lives. But still, little is known about what causes them or what is behind the rise.

Research carried out at the respected Harvard University in the US shows that the brain is working hard during lucid dreams. In fact, the level of the mental (精神

的) activity in some parts of the brain is similar to that of a person who is awake. Lucid dreamers seem to share certain personal characters. For example, in general they are quite creative. They are also good at digging deep into problems and going out of their way to solve them. Furthermore, they always believe in personal responsibility rather than letting society carry the can.

Our nightmares (噩梦) may show our waking worries, with the five most common ones-- falling, being run after, feeling disabled, being late and the death of a loved one. Men are more likely to have nightmares about fights or being fired while hair and tooth loss appear more in women's nightmares-perhaps showing worries about losing their looks. Research has also found that women have more nightmares than men. Their dreams are also scarier and more unforgettable.

Many people take running as a way to keep fit. They like to run in hot weather and enjoy the feeling of being wet through with sweat (汗) while running. Cold weather during winter months, with low temperatures and freezing cold winds, may keep people from running in the open air.

However, a new study shows that the drop in temperature is a good reason to run. In fact, running in cold weather helps improve one's performance. Many runners might find it easier to run in winter than in hot weather. The body needs less water on a cold day than in warm weather. In addition, lower temperatures reduce stress on the body. When you run in cold weather, your heart rate is lower.

John Brewer is a professor of applied sports science at St. Mary's University in London. For this study, he and other researchers put a group of people into a room where summer and winter weather conditions are recreated. The test subjects were asked to run 10,000 meters under both conditions and their biological measurements were recorded and studied.From the study, every movement runners make produces heat. The heat can be really damaging unless the body can lose it. One way in which people lose heat is by sweating. The body loses heat through sweat. The body also loses it by transporting the blood to the surface of the skin and it puts more stress on the heart, especially in hot conditions because it's much harder to lose heat when the outside environment is warm. As the result shows, running in hot temperatures results in 6 percent higher heat rates.

When running in cold conditions, the body does not have to work hard to move blood to the skin surface. Therefore, it requires less energy. The most important thing for people who run in cold conditions is to wear the right clothing. Keep as dry as possible when exercising in low temperatures. Wear warm and light clothing to keep sweat away from your skin. So don't let winter weather keep you indoors. Simply get ready for the low temperatures and start running.

Dorothy lived with her uncle Henry and aunt Em who were both farmers.Their house had only four walls，a floor and a small space under the floor to protect them from powerful winds.The house was in the middle of poor land with strong sunlight and few plants.Aunt Em used to be young and cheerful，but the sun and wind had taken away her happiness.Uncle Henry also looked serious and strict.Only Toto，could bring laughter into Dorothy's life.

One day，they heard low sounds of wind from both the north and the south.Uncle Henry realized a strong wind was coming.He rushed to protect the animals while Aunt Em hurried Dorothy to the basement.Suddenly，the house began to rock and rise to the air.In the center，but Dorothy found herself riding safely on the rising house.

Frightened，Toto ran around the room until Dorothy caught him and protected him from falling through the open door.She closed it carefully to avoid further danger.As hours passed，Dorothy slowly got over her fear.She finally fell asleep on her bed with Toto by her side.The wind had set Dorothy's house down gently in a beautiful country.

As she looked around, she saw green grass, fruitful trees, and colourful flowers.Birds with special feathers sang and flew around.As she stood enjoying the beautiful views, a group of strangely dressed people came near. They wore round hats that rose to a small point a foot above their heads. Three men were dressed in blue, and a little woman wore a white dress. They stopped and discussed in a low voice, as if afraid to come farther.

My name is Nancy. I'm twelve years old. I'm from China. I am a middle school student. I'm in Class Three. I like green and blue. This is my new friend. Her name is Wendy. She is thirteen years old. She is from England. We are friends, but we are in different classes. Wendy is in Class Four. She likes red and yellow. She is a good student. All the students and teachers in her class like her. Wendy likes swimming, and she often swims after school. I can't swim. I like basketball and football. I often play basketball with my sister in the afternoon. 

We like animals very much. I have a dog, and she has a cat. Where are we now? Oh, we are in the park. We are playing with our dog and cat.