Water is the1of all the things we eat and drink. Not many people understand this but2quite true. The human body3go without food for a long time. We've got many examples for this. Yet two4three days without water can usually make people5. Man can't live6water.

    Many people don't understand how7water the human body needs8work well, and many people, especially young people, do not drink enough,9in very hot weather. Our body is mostly water, about 65% to 75%. That is to say about two thirds of our body is water. When we do sports, some of the water will get away from our body.10we don't drink some water, we won't have enough water. If we don't have enough water, we'll feel tired and many of us will get ill. So you know how important water is to us.

    Every day in all kinds of weather, many thousands of men and women like jogging. Why has jogging slowly for long distance become so 1? Because jogging makes the heart stronger and helps people 2 weight. It can also help them feel 3 about themselves.

    Donald Robbins is a forty-two office worker, weighing about over 150 kg. He began jogging a few years ago because he felt he was too 4. At first he could only 5 about 100 yards. Two years later, he ran in a marathon race over twenty-six miles. Many joggers, like Donald Robbins, feel that if they can succeed in jogging, they can also succeed in 6 things.

    Should you jog too? If you do, be sure to ask your doctor for 7 Jogging may be too much exercise for you. Does jogging cost much? No, it actually costs almost 8 But it is very important to have a good pair of shoes that were made especially for jogging.

    How fast should you go? Jog with a friend and talk to each other as you run. If you have difficulty in 9 you are going too fast.

    How far should you go? Remember not to go too far or too soon. In fact, you should walk and do not run for the first few times. Then do some short jogs, but no more than "hat you can do 10. After that, increase your distance a quarter or half mile every two weeks or so.

    Obesity (肥胖症) is becoming a problem in our busy society, almost one in three American adults is now considered to be obese. Children obesity is also at an all-time high.

    Obesity means being very overweight. If you are obese, you have too much body-fat. If you eat more food than your body can use, this will make you put on weight. Food that your body does not need will be stored (储存) as fat by your body.

    The following are the major factors (因素) that increase the risk of obesity.

    What you eat plays a major role in weight gain. Eating a lot of fattening food such as hamburgers, sweet drinks, ice creams and other sweet food can increase the risk of becoming obese.

    If you do not do enough exercise, you will put on weight as the food you eat is not being used to make energy for physical activities.

    The chances of your being obese are greater if your parents are obese.

    There are many psychological (心理的) factors that cause people to eat too much. People who are worried, unhappy or bored will often eat to make themselves feel better. This is known as comfort eating.

    Age is another factor, as you tend (趋于) to be less active when you get older. When you get older, you need to eat less, and if you do not eat less, you will put on weight.

    Obesity can cause many health problems such as heart problems, high blood pressure and many other serious medical conditions.

    We're sitting too much and it's dangerous. Most Americans spend more than seven hours sitting 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 few blocks away from the office each morning and walk to work.

    This allows you to start off your mornings actively and be ready to take on the work. If you take the bus, get off one stop earlier to take some light exercise before 8 a.m.

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

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

    Ask questions and discuss questions face to face.

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

    Use your lunch break to move around outside.

    So many Americans today work during their lunch break. When possible, take advantage of this time to walk outside and enjoy the nice weather. Fresh air can make you keep a clear mind.

Feb. 17 should have been the start of the spring semester for many middle and primary schools in China. However, to control the spread of the COVID-19, many schools had delayed the start of the semester, following instructions from the Ministry of Education (MOE). But students in China were still studying.

Instead of having classes at school, many students in Beijing and Guangzhou began their first day of online classes on Feb 17. Students in Shanghai started online classes on March 2. "In the morning, I have English class, followed by Chinese and math, " Liu Bo, a Junior 3 student from Beijing, told Xinhua. "I have also learned about epidemic(流行病) prevention. "

According to the MOE, students were mainly taking classes to review previous knowledge rather than taking new classes during the online study period. Online courses were required to include contents about epidemic prevention, psychological health (心理健康) and educational activities (教育活动).

"Online courses are only temporary measures (暂时的措施) taken during the epidemic, so when the new semester begins, schools should not replace(替代) classroom teaching with online classes, " Lu Yugang from the ministry told China Daily.

The ministry also called on schools not to increase their students' schoolwork burden(负担). Schools should not ask students to study online for long periods of time or study things beyond( 超出) their curriculum(课程). Students must have enough time to rest, the ministry added. Also, it stressed that protecting students' eyesight must be a priority(优先).