With the COVID-19 epidemic hitting China, many of you might want to know more about the virus. The disease is caused by a newly-found type of coronavirus (冠状病毒). Coronaviruses are a large family of viruses. The word “corona” comes from Latin and refers to crowns. When people first saw a coronavirus under a microscope (显微镜), they found that its spikes (刺突) made it look like a crown. That’s how the virus family got its name. Some coronaviruses cause disease in humans; others spread illness among animals, including camels, cats and bats.

We have found seven types of coronavirus that can infect(传染) humans so far. Four of them are common and cause respiratory (呼吸道的) illnesses such as mild flu. Rarely, animal coronaviruses can evolve (进化) and then spread among people, such as Middle East respiratory syndrome (MERS，中东呼吸综合症) and SARS(非典). The novel coronavirus (新型冠状病毒), which was first found in Wuhan, is the seventh one.    

Early to bed and early to rise makes a man healthy, wealthy (富有的) and wise (明智的).

This is an old English saying. It means that we should go to bed early at night and get up early in the morning. If we do, we shall be healthy. We shall also be rich and clever.

Is this true? Perhaps it is. The body must have enough sleep. Children of your age need ten hours’ sleep every night. If you go to bed late, you can’t have enough sleep. Then you can’t think carefully and your homework will be wrong. You will not be wise and you may not become rich!

Some people go to bed late at night and get up late in the morning. This is not good for them.

We should sleep at night when it is dark. The dark helps us sleep well. When the daylight comes. we should get up. This is the time for exercise. If the body is not used, it will become weak. Exercise keeps it strong.

Exercise helps the blood (血液) to move around inside the body. Blood takes nutrition (营养) to all parts of our bodies. The brains (大脑) in our heads also need blood. We think with our brains. If we keep our bodies healthy, take exercise, and we can think better!

Our bodies also need air to work well. Without air we will die. Get up early in the morning and we can have plenty of clean, fresh air. That will keep us healthy and happy.

A proverb is a short, well-known saying that expresses a common truth or belief. Proverbs are found in most cultures and are often very old. The phrase, "The early bird catches the worm, "may be true. It means people who wake up early get more done than people who don’t. 【小题1】. He said," Early to bed early to rise makes a man healthy, wealthy, and wise."

Scientists have found that people who go to bed before 11 p.m. may do better in life than people who sleep around 2:30 a.m., which is also believed by a group of researchers. 【小题2】. Their research showed that people who slept and got up early(early birds)had an average (平均) sleep over people who slept and woke up late at night (owls).There were differences in the brain function (功能) of early birds and night owls.

The scientists tested 38 people in their research. These persons answered questions about their sleeping habits and when they felt tired during the day. 【小题3】. One is called early bird, the other is night owl depending on their answers.