What is the sky? How high is it? What color is it? What birds can live above it? These questions are difficult to answer, aren't they? In fact, the sky has no color. Then why does the sky look blue?

    We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can't fly very high. That is because the air gets thinner when they go higher. The same will happen to us if we go high enough. If we go up about 1,200 kilometers from the earth, we'll find no air there. Some birds can fly into the sky as high as a plane, but they cannot fly or live without air.

    Looking up above us, you will see the blue sky with white clouds. It is usually light blue. The color would be bluer when you see on the top of a high mountain. And you will see fewer clouds in the sky between you and the sun. Sometimes the sky doesn't look blue. When the sun rises and falls, you will see red, orange and other colors in the sky, such are the most beautiful moments of the day.

    Who can see the colors of the sky high above the earth? The astronauts! They can see those beautiful colors of the sky from the outer space. However, before flying into the outer space, they sit in a spaceship high above the earth and there is no air at all. The sky would be that dark and its color would be black.

    Now you may understand that we see colors because the air scatters (使散射) the sunlight. Light travels through the air. Without air there would be no colors.

Famous Places around the World

Do you get angry easily? If you do, you need to control your feelings. Getting angry with people can make you{#blank#}1{#/blank#}(失去) friends easily.

Gary Egeberg, an American high school teacher, has written My Feelings Are Just Like Wild Animals to help you control your feelings. It tells you how to stay cool when something bad {#blank#}2{#/blank#}(发生) to you. The book says that getting angry only makes problems {#blank#}3{#/blank#}(更差的). It can never make them better. The book says you can control your anger easily—all you have to do is to tell {#blank#}4{#/blank#}(你自己) not to be angry. It also teaches you some ways to control your anger which are useful {#blank#}5{#/blank#}(足够的). Here are the top three.

Keep {#blank#}6{#/blank#}(日记). Every time you get angry, write down the {#blank#}7{#/blank#}(原因)—why you are angry and what you are angry about. Look at it later and you will find it is not .{#blank#}8{#/blank#}(必需的) to get angry at all.

Tell your friends not to keep talking to you when you get angry. You can't always get {#blank#}9{#/blank#} (一起) with your friends. Sometimes, you need to be quiet.

Do something different. When you {#blank#}10{#/blank#}(确实) get angry, walk away from the problem and go somewhere else.

Pinyin is a modern {#blank#}1{#/blank#}. It was invented in 1958 to help illiterate(不识字的) Chinese to learn how to read. It worked out quite well. {#blank#}2{#/blank#} people learned to read quickly with the help of pinyin.

 Pinyin has been used in other ways, too. It helps to develop the use of Standard Chinese, or Mandarin(普通话), so that people who speak different dialects(方言) can understand each other. It also makes it . much {#blank#}3{#/blank#} to type Chinese characters on computers and cellphones.

 Pinyin is also finding its place in other languages. The Oxford English Dictionary now{#blank#}4{#/blank#} more than 100 pinyin expression, such as jiaozi for" dumpings" and zhongguomeng for" Chinese dream".

 Foreign media sometimes use pinyin in reporting about China.

 Now, pinyin is not only a language {#blank#}5{#/blank#}, but also a cultural bridge that connects China to the world.

People in the UK Say Sorry for Many Uses

{#blank#}1{#/blank#}lf a person burps（打嗝) at the dinner table or runs into someone, you'll probably hear "Oops, I'm so sorry!"

{#blank#}2{#/blank#}Us scientist Robert Trivers gave a possible answer in his studies. He said that we are polite because we need to belong and be included in society to live. So we be have well, help each other and say sorry, hoping that we can be treated well and be safe. 

In the UK. politeness could be, as the Great British Mag put it, "a throwback （符合旧时代的事物)to the British class system. "{#blank#}3{#/blank#}. 

Does this mean that when British people say sorry, they don't mean it?{#blank#}4{#/blank#}But saying sorry has its uses. Ilf you're ever in the UK, remember a little "sorry" can go a long way. 

What does the writer mean by concluding "If you're ever in the UK, remember a little sorry' can go a long way. " ( answer with no more than 15 words. ) {#blank#}5{#/blank#}

Automated（自动化的） kitchens aren't only in shows like Star Trek. Now, robots can cook chicken, make pizzas and salads. AI can create recipes （食谱） depending on what's in the kitchen. More plans are being made to automate great dining kitchens.

At first, technology is often expensive, so restaurants and other businesses use AI kitchen technologies first. Later on, the prices might drop enough for people to use at home. This could change how homes and society work.

The good things about AI kitchens are that cooks don't have to do boring tasks like peeling potatoes or standing at a work area for a long time. This gives them time to do more important things. For people who want personalized food, AI can meet different special diets and tastes.

But there are also risks. Cooking is a good activity that helps with communicating and expressing oneself. But if humans aren't needed in kitchens anymore, these benefits might disappear. Family relationships might not be good without a kitchen where people work together.

Also, the kitchen is like a science lab at home. It's important for science education. Cooking helps kids learn about materials, chemistry and problem- solving.

We also need to think about cultural risks. For example, AI might mess up traditional recipes and methods. It might make cultural details（细节） seem the same or too simple. This could mean that AI and robot cooks make fewer different dishes. If we depend too much on technology to make food, there might not be much variety（多样化） in taste. It's like how AI art pictures on different apps seem similar.

Convenience can have a high cost. So it's important to think about the possible social problems that new technologies might bring, especially in areas like food that are important to our daily lives.