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.

It is easy for many people to catch a cold in the springtime or fall. It makes us wonder if scientists can send a man to the moon, why can't they find a cure for the common cold? The answer is easy. There are actually different cold viruses out there. You never know which one you will get, so there isn't a cure for each one.

When a virus attacks your body, your body works hard to get rid of it Blood rushes to your nose and causes a block in it. You feel terrible because you can't breathe well, but your body is actually eating the virus. Your temperature goes up and you get a fever, but the heat of your body is killing the virus. You also have a runny nose to stop the virus from getting into your cells. You may feel very uncomfortable, but actually your wonderful body is doing everything it can to kill the cold.

Different people do different things to deal with colds. In the United States and some other countries, for example, people might have chicken soup to help them get over the cold. Some people take hot baths. Other people take medicine to stop different symptoms(症状)of colds.

There is one interesting thing to note一some scientists say taking medicine when you have a cold is actually bad for you. The virus stays in you longer because your body doesn't have a way to fight it and kill it Bodies can do an amazing job on their own. There is a joke, however, on taking medicine when you have a cold. It goes like this:

It takes about one week to get over a cold if you don't take medicine, but it takes only seven days to get over a cold if you take medicine.

Eating lots of vegetables is good for our health. Different vegetables can help our bodies in different ways. Eating carrots is good for our eyes. Carrots can help us see better at night. Do you want to have strong teeth? If so, you can eat some peas(豌豆). Peas have vitamin(维生素) K in them. Vitamin K is helpful to your teeth. Do you like tomatoes? They look nice. Doctors call tomatoes "healthy vegetables", because they can help you not to get cancer(癌症). They also have a kind of special vitamin PP. It can keep our skin(皮肤) healthy. So it is important to eat some tomatoes. Don't forget about spinach(菠菜). The spinach leaves have vitamin A, vitamin C and vitamin E. They help our bodies make red blood cells (血红蛋白).Vegetables are very important to us, but we can't only eat vegetables. We also need to eat other kinds of food to keep healthy.

    Many of usdon't pay much attention to the importance of eye care. It is said that if youtake care of your body, then you can surely be healthy. That is why our eyesshould be given a lot of care. Natural eye care should be put in a number oneplace.

    There areseveral causes leading to poor eyesight like not enough food, genes (基因) and aging (老化). Televisions, computers and reading are also the causes of havingpoor eyesight. If you work in front of the computer, it is best to take a breakevery once in a while. Something dirty can cause redness and they will make youfeel uncomfortable. It is bad for your eyes too. If this happens, the best wayis to clean your eyes by using cold water. You must also try your best toprotect your eyes from harmful things. For example, sunglasses are not just forfashion but they can also serve as a great way to protect your eyesight fromultravioletrays.

    Eatinghealthy foods will do good to your eyesight. Remember that vitamins A, C and Eare good for eyes. Try to eat food groups that have these vitamins. And youshould do eye exercises because exercises protect your eyesight too. If aperson exercises regularly (定期地) and eats the right kind of food, his eyes will stay in goodcondition for a long time.

    All aboveare natural ways of eye care that help us keep healthy eyes. Being happy allthe time can be helpful to a person's eyesight too. In a word, eye care is veryimportant, no matter how old a person is.

Mr. Smith is 100 yearsold, but he is very healthy. He can read, play chess with people, and take careof himself(他自己). Many people want toknow his secrets (秘密) about keeping healthy and livinga long life. Here is what Mr. Smith says:

"My secrets aresimple. You can learn them easily. First, you should go to bed early andget up early every day. This is a good habit. For me, I usually go to bed at9:00 at night and get up at 6:00 in the morning."

"Second, do more(更多的) exercise. I always go out for a walkbefore having breakfast. In the morning and afternoon, I do some simple exercise,too.

"Third, make morefriends. I have many friends. Some of them are old. Some of them are not. Itmakes me happy to be with them. That is also important to live a longlife."

There is an English saying:" Laughter is the best medicine." Until {#blank#}1{#/blank#}, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. They find that it {#blank#}2{#/blank#} people's blood pressure, the heart beating and breathing. It {#blank#}3{#/blank#} works the stomach and even the feet. So laughter exercises the body and improves people's health.

As a result of these discoveries, some doctors in the United States now hold laughter clinics; in which they help to improve their patients' condition {#blank#}4{#/blank#} encouraging them to laugh. They have found that even if their patients do not really feel like {#blank#}5{#/blank#}, making them smile is enough to produce beneficial effects similar to those caused by laughter.