Do you know why different animals or pests have their special colours? Colours in them seem to be used mainly to protect themselves. Some birds love eating locusts (蝗虫), but birds cannot easily catch them, why? It is because locusts change their colours with the change of the colours of crops. When crops are green, locusts look green. But as the harvest (收获) time comes, locusts change to the same brown colour as crops have. Some other pests with different colours from plants are easily found and eaten by others. So they have to hide themselves for living and appear only at night.

    If you study animals' life, you'll find the main use of colour is to protect themselves. Bears, lions and other animals move quietly through the forests and they cannot be easily seen by hunters. This is because they have the colours much like the trees.

    Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体) when it faces danger. While the liquid spreads, its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

    Benjamin Banneker was born a few months before another great American—George Washington. Benjamin was black, but he was not a slave (奴隶). He and his mother and his grandmother were free. Benjamin's grandmother came from England. In America she got a job and worked for many years to pay for her boat trip across the ocean. After working many years, she saved enough money to buy a farm. Benjamin lived with her for a while. She taught him to read, write and do arithmetic (算术).

    Benjamin's neighbours knew that he was clever. They were not surprised when he built a large wooden clock. He made each piece after studying a small pocket watch. The clock made him famous, for it was one of the first clocks built in America. People from other places began to send hard problems of all kinds to Benjamin to settle.

    Thomas Jefferson heard of Benjamin Banneker's ability to settle hard problems. He asked Banneker to help build the city that was to be the capital of the United States—Washington, D.C. Banneker worked hard on the plans for the city. He marked where the streets and buildings—the Capitol (美国国会大厦), the White House, and many other places should be built.

    Later, L' Enfant, the Frenchman who had designed the new city, had a quarrel, and went back to France in anger. He took all of the plans away. The workmen couldn't build without any plans to follow.

    For a while it seemed that the plans for the capital might have to be changed, but Benjamin Banneker remembered the plans he had helped draw. He drew each again as he had built each piece of his clock.

    If it weren't for Benjamin Banneker, Washington,

    D.C might look very different from the way it does today.

Face the Stress

    Have you had a headache during a test? Have you ever been so worried about something that you have a headache or even can't sleep at night? If so, then you know what stress is. Stress is what you feel when you are worried about something. {#blank#}1{#/blank#}You may feel angry, sad, scared, or afraid—all of which give you a stomachache or a headache.

    {#blank#}2{#/blank#}Some kinds of stress are beneficial and others are not. Good stress might happen when you're called to answer questions in class or when you have to give a speech. {#blank#}3{#/blank#} For example, you may do a better job in your test if the stress pushes you to prepare better before the test.

    On the other hand, bad stress can happen if the stress lasts too long. You may not feel well if your parents are fighting, if a family member is sick, if you're having problems at school, or if anything else makes you unhappy every day. That kind of stress isn't going to help you. {#blank#}4{#/blank#}

    {#blank#}5{#/blank#} Make sure you keep yourself in mind: Sleep, exercise, leisure, and food. If you get enough sleep and eat healthily, and if you exercise and leave and leave time for fun, you'll probably feel less stressed.

    Many of us don't pay much attention to the importance of eye care. It is said that if you take care of your body, then you can surely be healthy. That is why our eyes should be given a lot of care. Natural eye care should be put in a number one place.

    There are several 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 having poor eyesight. If you work in front of the computer, it is best to take a break every once in a while. Something dirty can cause redness and they will make you feel uncomfortable. It is bad for your eyes too. If this happens, the best way is to clean your eyes by using cold water. You must also try your best to protect your eyes from harmful things. For example, sunglasses are not just for fashion but they can also serve as a great way to protect your eyesight from ultraviolet rays.

    Eating healthy foods will do good to your eyesight. Remember that vitamins A, C and E are good for eyes. Try to eat food groups that have these vitamins. And you should do eye exercises because exercises protect your eyesight too. If a person exercises regularly (定期地) and eats the right kind of food, his eyes will stay in good condition for a long time.

    All above are natural ways of eye care that help us keep healthy eyes. Being happy all the time can be helpful to a person's eyesight too. In a word, eye care is very important, no matter how old a person is.

Animals

    Corona viruses are common in animals. Sometimes, animals get infected (感染的) with these viruses which may then spread to human beings. To protect yourself, you should not visit live animal markets or have direct contact with wild animals. Stay away from raw meat, animal organs and other undercooked animal products.

    When an infectious pet was found in Hong Kong, some may wonder if one can get virus from their pets. Until today, there is no evidence that a dog, cat or any pet can transmit (传播) COVID-19. Please do not kill or give up pets!

Touching surface with virus

    Studies suggest that COVID-19 virus may stay on surfaces for a few hours or up to several days. However, the number may change under different conditions such as type of surface, temperature or the environment.

    If you think a surface may be infected, clean it with ethyl alcohol (酒精). After touching it, clean your hands with alcohol or wash them with soap and water. Avoid touching your eyes, mouth, or nose.

Package (包裹)

    Before delivering to your home, a package has been moved, travelled, and exposed to different conditions and temperature. Therefore, the possibility of being infectious because of your package from COVID-19-reported areas is rather low. There is no need to send your package back.

Smoking

    An article posted on Wechat recently says that cigarette can protect smokers from COVID-19 and thus make cigarettes sell very well. It is an online rumor (谣言)! As has been known, smoking harms people's health. It weakens the immune system and worsens diabetes and blood pressure. No smoking is still a must!

Transportation

    According to Feng Luzhao, an expert from the Chinese Center for Disease Control and Prevention, the major routes of transmission are still through respiratory droplets and direct contact. In order to protect yourself in underground station, wearing a mask and keeping your hands clean are good ways. People are also encouraged to use a personal transportation card or pay for the ticket via an app. After taking public transportation, washing hands is necessary.

A famous designer（设计师）and a university student produce a new cup called Vessyl. They have spent several years1it. The smart cup can not only tell Coca Cola from Pepsi Cola,2also tell people whether they should drink water or not.

When people3liquid（液体）into this smart cup, a few seconds（秒）later, it can check this kind of liquid and tell them what it is. Then it gives4information about the drink, such as sugar, fat and calories. When people put the cup in their5, it can also show them condition of their bodies. If they are6, Vessyl will tell them to drink water.

"My partner and I want people to7healthy. In modern society, people are usually8busy to do exercise, or even drink enough water every day. They have much9. We produce this smart cup so that people can make a choice10," the designer said.