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.

Today, many students are always stressed out. They are often too busy to think{#blank#}1{#/blank#} their diets and exercise. Healthy eating, along with regular(定期的) exercise {#blank#}2{#/blank#} (keep) you healthy. Do you think it is the only way to keep us in {#blank#}3{#/blank#}(healthy)?

As we know, it is important to give your body the energy it needs. Teenage girls {#blank#}4{#/blank#} (need) about 2,200 calories(卡路里) a day and boys need a bit more. {#blank#}5{#/blank#} (fiftieth) percent of your calories should come from rice, bread, {#blank#}6{#/blank#}(vegetable) and fruit. You also need to d{#blank#}7{#/blank#} a lot of water, six to eight glasses a day. Enough water will improve your skin and give you healthy hair.

Exercise can help to make you look good, feel good {#blank#}8{#/blank#} be healthy. Scientists suggest that teenagers should spend at{#blank#}9{#/blank#}(little) 30 minutes exercising every day.

Exercise can make you feel {#blank#}10{#/blank#} (relax)and energetic. It can even help you sleep better at night.

Let's eat healthily and take more exercise.

    We'resitting too much and it's dangerous. Most Americans spend more than seven hourssitting every day, and the more you sit, the weaker your body will be.Fortunately, there are simple changes you can make during the day—anywhere, even at the workplace—to improve your health.

    Park a fewblocks away from the office each morning and walk to work.

    Thisallows you to start off your mornings actively and be ready to take on thework. If you take the bus, get off one stop earlier to take some light exercisebefore 8 a.m.

    Get up andmove around the office once every 60~90 minutes.

    Whenyou're busy with work, it's easy to forget the time. Set the alarm to remindyou to get up and take a walk around the office. You can use this time to fillup your water bottle or go to the bathroom.

    Askquestions and discuss questions face to face.

    Go to yourco-workers' office to discuss questions face to face, rather than send an emailevery time you have a question. This gives you a good excuse to move.

    Use yourlunch break to move around outside.

    So manyAmericans today work during their lunch break. When possible, take advantage ofthis time to walk outside and enjoy the nice weather. Fresh air can make youkeep a clear mind.

Better hygiene (卫生) habits can help you stay healthy

According to the World Health Organization, 60 percent of people's health problems are related(与…相关) to everyday hygiene habits. As the COVID-19 spreads across the world, governments and organizations in many countries have suggested that people should pay more attention to their daily hygiene practices.

In China, for example, people usually share dishes together at the dining table. But this habit has a high risk of spreading diseases through saliva(唾液). To fight against COVID-19, many cities in China, including Beijing, Shanghai and Guangzhou, have called on people to order separate(分开的)meals or use serving chopsticks(公筷) to take their food. Many people also suggest that Chinese should continue these habits after the outbreak.

In the US, the Centers for Disease Control and Prevention has asked people to develop healthy hygiene habits. For example, people should cover their mouth and nose with a tissue when they cough or sneeze.

    According to a survey by YouGov, a British market research company, many Americans have taken action to change their daily habits in the face of COVID-19.