Health is the most important thing in the world．Nothing is more important than health．If one takes away our money, houses, cars, or even our clothes, we can still survive．{#blank#}1{#/blank#} That is why we always try to eat in a healthy way and exercise often.

    How can we keep healthy? In order to eat healthily, I usually avoid eating food high in fat, like French fries or cookies, which are junk foods．{#blank#}2{#/blank#} Besides, I only eat a little meat.

    {#blank#}3{#/blank#} Taking exercise every day helps us build a strong body．Regular exercise is an important part of keeping me healthy.

    What's more, I think friends are important part of one's health．{#blank#}4{#/blank#} I always feel better when I am with friends than I am alone．When I am with my friends, I always laugh．Laughing is also an important part of health．It is good to stay with my friends.

    By eating properly and exercising regularly, I can keep my body at a proper weight and keep healthy．By spending time with my friends, I can keep my mind as well as my body happy．These things sound easy to do, but not many people can manage them．{#blank#}5{#/blank#}

    Radar（雷达） is an electronic device that detects planes, ships, coastlines, landmarks, and even storm clouds. The name radar comes from the first letters of the words radio direction and ranging. As the human eye uses light waves to see, radar “sees” with radio waves. Without radar, planes could not land safely in bad weather and ships could not move safely in thick fog{#blank#}1{#/blank#}

    In the 1800s it was discovered that radio waves could be reflected from objects. But scientists did not make great advances in radar research until the 1930s, when the world was threatened by war{#blank#}2{#/blank#}It has been used widely in almost every conflict since then.

    Echoes make it possible for radar to work. When a beam of radio waves is sent out, it strikes on an object and returns an echo. This echo is picked up by radar and recorded on a screen similar to television screen. On the screen an observer sees a flash, or a blip, that shows the direction and distance of the object{#blank#}3{#/blank#}

    Airport control towers use radar to guide planes in for safe landings. Almost all large ships depend on radar to prevent collisions with icebergs or other ships{#blank#}4{#/blank#}Weather forecasters “see” the size, direction, and speed of storms on radar screens. Astronomers can even use radar to measure accurately the distance to the moon. Thus, the device has generated major advancements.

    {#blank#}5{#/blank#} Huge radar antennas have been installed all over the United States. They guard us against possible enemy attacks. We have ballistic—missiles (战略导弹)warning systems that can alert us to attacks when missiles are more than 1,000 miles away. Other radar systems warn us against enemy aircraft and even spying space satellites.

A. Police track speeders in radar-equipped cars.

B. These measurements are now highly accurate.

C. The device can be used in a wide range of fields.

D. During World War II many countries used radar effectively.

E. It is therefore especially valuable to shippers and travelers.

F. Today radar is used by commercial airliners and weather forecasters.

G. Strengthening national defense is one of radar's most important functions.

    With time going on, dogs have developed a special relationship with people. Recently, however, some dogs have taken a different role in people's lives — therapy dogs.

    {#blank#}1{#/blank#} Some therapy dogs visit patients in hospitals or nursing homes, while others visit children in schools and libraries. They are there to help children become better readers.

    Reading programs that use therapy dogs have been in existence for more than ten years. All therapy dogs of this program are registered with an organization that tests the dogs to make sure they have the right personality for the job.

    {#blank#}2{#/blank#} Both the dogs and the handlers are volunteers with the reading program.

    At the start of a reading therapy session, a child and a dog are introduced. The pair is allowed to settle down in a quiet corner together. {#blank#}3{#/blank#} An adult handler stays nearby but generally lets the dog perform its job without being interrupted. Sometimes, a handler may ask a question that encourages the child to work with the dog to help the child feel more comfortable.

    Not every child will be able to be part of a reading therapy program that uses dogs. A few children might be allergic to dogs or afraid of them; some children might have cultural traditions that prevent them from touching a dog. {#blank#}4{#/blank#}

    Reading therapy programs inspire learning and change for human beings. The readers benefit a lot, gaining confidence and learning that reading aloud can be a relaxing experience.

    {#blank#}5{#/blank#} They spend time with human friends. For dogs that love human companionship and a quiet place to rest, being part of a reading therapy program can be a great way to spend a few hours being with humans each day.

A. As the child reads, the dog usually lies quietly and listens.

B. A dog's handler also takes a class and must pass a test to work in the therapy program.

C. When reading to an animal, some children may become relaxed.

D. A therapy dog is more of a companion and is trained to help people in different ways.

E. But therapy animals also serve in many other areas.

F. In these circumstances, other animals are available, such as cats and parrots.

G. But how do the therapy dogs benefit from it?

    If you're a gamer who's constantly glued to your phone, it could be time to ask for medical help.

On June 18, 2018, the World Health Organization（WHO）officially listed "gaming disorder" as a mental health condition. {#blank#}1{#/blank#}

"Video gaming is like a non-financial kind of gambling（赌博）from a psychological point of view," Mark Griffiths, a professor from Nottingham Trent University in the UK, told the Associated Press（AP）. "Gamblers use money as a way of keeping score, while gamers use points."

{#blank#}2{#/blank#}"People need to understand this doesn't mean every child who spends hours in their room playing games is an addict, otherwise doctors are going to be flooded with requests for help," Joan Harvey, a spokeswoman for the British Psychological Society, told AP.

{#blank#}3{#/blank#} For example, a 21-year-old Chinese woman surnamed Wu in Guangdong province went blind in one eye after playing the mobile game King of Glory for a whole day. "On days when I have no work, I usually get up at 6 am, eat breakfast and play until 4 pm," she told the South China Morning Post. "Then I'll eat something, have a nap（小睡）and play until 1 am."

    Wu isn't alone. According to a study published by China Youth Daily, about one in five young Chinese people play online video games for at least four to five hours per day. {#blank#}4{#/blank#} In April, the Ministry of Education issued a notice asking Chinese schools and parents to prevent students from becoming addicted to the Internet and games.

    Other countries have also taken action. {#blank#}5{#/blank#} Meanwhile, in Japan, some mobile phones have a special mode for children that lets their parents control what games they can download and how long they can play.

A. This means it's now on the same list as other mental illnesses.

B. Thankfully, measures have been taken to deal with the problem.

C. We often see people around us playing games on their mobile phones.

D. In South Korea, children are forbidden to play video games after midnight.

E. WHO's main work is to improve the mental health of individuals and society.

F. But if you lose control over your gaming habits, you'll face serious problems.

G. However, it doesn't matter if you play your favorite game now and then.

    "Cleverness is a gift while kindness is a choice. Gifts are easy—they're given after all. Choices can be hard."

    I got the idea to start Amazon 16 years ago. I came across the fact that the Internet usage was growing at 2300 percent per year. I'd never seen or heard of anything that grew that fast, and the idea of building an online bookstore with millions of titles was very exciting to me. I had just turned 30, and I'd been married for a year. I told my wife that I wanted to quit my job and go to do this crazy thing that probably wouldn't work since most start-ups don't and I wasn't sure what to expect. She told me I should go for it. As a young boy, I had been a garage inventor. I had always wanted to be an inventor, and she wanted me to follow my passion.

    I was working at a financial firm in New York City with a bunch of very smart people and a brilliant boss that I much admired. I went to my boss and told him that I wanted to start a company selling books on the Internet. He took me on a long walk in Central Park，listened carefully to me and finally said, "That sounds like a really good idea，but it would be an even better idea for someone who didn't already have a good job." That logic made some sense to me，and he convinced me to think about it for 48 hours before making a final decision. Seen in that light, it really was a difficult choice，but ultimately, I decided I had to give it a shot. I didn't think I would regret trying and failing. And I suspected that I would always be haunted by a decision to not try at all.

    After much consideration, I took the less secure path to follow my passion, and I'm proud of that choice. For all of us, in the end, we are our choices.

Today, what we have, is an always-in-your-pocket, 24/7 news cycle. When you open a news app, you'll notice a brief moment when the "old news" is still there. In a flash, the ancient history of a few hours ago is swept away for the next "breaking news". {#blank#}1{#/blank#} It's endless, but you had better keep up. 

Researchers introduce this world to the phrase, "noise bottleneck". A noise bottleneck is where we are overwhelmed with so much information or noise that our cognitive （认知的） abilities can't keep up. {#blank#}2{#/blank#} Thus, while our attention can watch hours. of videos, our long-term learning processes can't. 

{#blank#}3{#/blank#} We watch TV holding our phones, and we listen to music while shopping. However, the human brain might have structural limitation rooted in the cognitive architecture which causes the slowing down that occurs when two tasks are performed at the same time. 

In short, your brain is not as good as you think it is. You are a human being who can only take in so much a day. Understanding the noise bottleneck allows us to fix it. So, here are three tips to get you going:

Clear your content-set up a new account on social media and follow only accounts or people that you think are really valuable. 

Single-task-you don't need to rid the phone but do rid the distractions. {#blank#}4{#/blank#} Say, "I will only read this magazine after dinner. Multitasking is for show; single-tasking is for pros. 

Accept your limits-you'll never read all the news. Accept you can only choose two or three and embrace that fact. {#blank#}5{#/blank#} You're getting more out of those few than that "super-productive" person on social media who says they read five books a week. After all, it's better to have a little remembered than a lot forgotten. 

A. Give yourself a time limit or restriction if it helps. 

B. Don't beat yourself up that you're being unproductive. 

C. Every second, you are presented with new information. 

D. Breaking through the noise bottleneck is a legendary idea. 

E. The matter is made worse by our modern addiction to multitasking. 

F. Multitasking has dramatically changed the way we use information. 

G. Our brains have limited resources, spread across numerous functions.