Not all fat is created the same, according to several new studies. We all know there’s good cholesterol and bad cholesterol. It turns out there’s good and bad fat, too. Good fat is medically known as “brown fat”.
Brown fat, mainly found in the neck and shoulders of newborns, has the ability to burn lots of calories, which can keep them warm. It makes up about 5 percent of a baby’s total weight. We lose most of our brown fat as we grow up. By the age of six, we have less than 5 percent of the brown fat we were born with; the fat we get over time is almost all white fat.
Researchers now believe that some people keep brown fat until adulthood. Brown fat—the “good” kind can burn excess energy better to make heat. But white fat—considered the “bad” kind—is a way for your body to keep excess energy and take more calories than you use. It is bad for the body. And it doesn’t use much energy, is hard to burn off, and causes other health problems.
Some studies suggest that taking a cold shower or an ice bath could let brown fat help your body burn more calories. Researchers have also found ways that may help people get brown fat without the need for cold. You build fat from the foods you eat. As brown fat is rich in iron, choosing food rich in iron can keep you healthy. Nutrition is very important for your health, especially if you want to increase brown fat.
One main reason of the growth in illnesses is the increasing level of white fat. Though changing white fat into brown fat is helpful to increase brown fat, some scientists think they will learn how to keep brown fat as large and active throughout adulthood as they are like babies. We should try our best to keep brown fat forever instead of having to recreate it.
1. Who has the most brown fat among the four persons?| A．A teenage girl. | B．A college student. | C．A new-born baby. | D．An elderly teacher. |
| A．It can cause health problems. | B．It burns calories in a better way. |
| C．It is found in the neck and shoulders. | D．It keeps excess energy in the human body. |
| A．Ways of increasing the number of brown fat. |
| B．The advantages of the brown fat. |
| C．The importance of nutrition in brown fat production. |
| D．The temperature in increasing the brown fat. |
| A．How to recreate more brown fat. | B．How to turn white fat into brown fat. |
| C．How to make the danger of white fat less. | D．How to keep brown fat. |
相似题推荐
【推荐1】Animals, including insects, do not have a language like ours. They do not talk to each other in words or sentences. But if we watch them, we can see that they do have ways to communicate.
Can you see the rabbit’s tail which is moving up and down? When rabbits see this white tail moving up and down, they are warning each other to run: They know that there is danger. The rabbit has told them something without making a sound. Many other animals use this kind of language. When a cobra(眼镜蛇) is angry, it raises its sound. It has given them a signal and makes itself look fierce. This warns other animals. When a bee has found some food, it goes back to its home. It cannot tell the other bees where the food is by speaking to them, but it does a little dance in the air. This tells the bees where the food is. Some animals say things by making a sound. A dog barks, for example when a stranger comes near. A cat purrs when pleased. Some birds make several different sounds, each with its own meaning.
Sometimes we human beings speak in the same way. For example, we make sounds like “Oh” or “Ah!” when we are frightened or pleased or when we drop something on our toes. But we have something that no animals have—a large number of words which have the meanings, information in words and sentences, which no other animals can do. No other animals have so wonderful a language as we have.
1. A rabbit uses its tall to __________.| A．warn other rabbits of danger | B．tell other rabbits where food is |
| C．make itself look fierce | D．help it to run fast |
| A．does a little dance | B．raises its head |
| C．moves up and down | D．makes a loud noise |
| A．rabbit | B．bee | C．bird | D．cat |
| A．all living things | B．human beings | C．some birds | D．all animals |
【推荐2】Diamonds are a kind of shape with four sides. The sides are all the same length (长度). Do you know another shape with four sides? Squares!
Look at the shapes in Picture 1. In both of these shapes, there are two white lines. The white lines go from one corner to the opposite corner.
| A．A diamond’s corners are different! |
| B．They cross in the middle of the shape. |
| C．All four sides of a square are equal to each other. |
| D．Think about where you’ve seen diamond shapes. |
| E．Squares have two crossed lines that are the same length. |
A forest is like a football group. It sounds unusual, but it’s true. Each player does an important job, but they can’t win by themselves, so they work together. The same is true of all plants and animals in a forest. They depend on (依赖) each other to live. We call this an ecosystem.
There are three jobs in an ecosystem: producer, consumer and decomposer. The trees in the forest produce food by themselves. Giraffes (长颈鹿) themselves can’t make their food, so they consume or eat the trees’ leaves. But sometimes hungry lions or other animals eat them. When animals die, their bodies become part of the soil and air to help the forest grow. So the ecosystem can keep on going.
Ecosystems come in lots of kinds and sizes. A back garden or even a big sea can be an ecosystem. The key thing is that an ecosystem has to be balanced (平衡的). If there weren’t animals to eat giraffes, giraffes would eat too many leaves. This wouldn’t be good for the trees, and this would make it difficult for giraffes to find food. Different weather and natural disasters (灾害) can also change the ecosystems. People can also bring problems by cutting down the trees and so on.
Ecosystems are everywhere. They play an important part in our life. It is necessary for us to do what we can to keep them working well.
1. How does the writer start this text?| A．By listing numbers. | B．By asking a question. |
| C．By telling a story. | D．By giving an example. |
| A．Five. | B．Four. | C．Three. | D．Two. |
| A．People plant many trees every year. | B．It’s difficult for giraffes to find food now. |
| C．The terrible earthquake can change the ecosystems. | D．Ecosystems only come in a back garden or a big sea. |
| A．To ask people to protect the ecosystems. | B．To introduce different jobs in the ecosystems. |
| C．To teach us how to keep ecosystems balanced. | D．To show the writer’s ideas of protecting animals. |
| A．Nature. | B．Sports. | C．Food. | D．Arts. |
【推荐1】Children today stay indoors most of their time. Most of them watch TV, play computer games and some of them do their homework. Figures (数据) show that today’s youngsters (年轻人) stay outside for just over an hour each weekday, and fewer than five hours on Saturdays and Sundays.
It also shows that 58 percent of parents wish their children to play outdoors more often, and they seriously worry their children don’t spend enough time playing outdoors.
In fact, playing outdoors is so important for children — not only to help them stay active and healthy, but also to communicate with friends, and make those colorful childhood (童年) which we look back on so warmly.
And because they don’t go out, they don’t know their own communities as well as their parents did, they don’t have as many friends in the area and they don’t have the same chances for fun as their parents did.
1. How long do today’s youngsters play outdoors on each weekday according to the study?| A．Just over one hour. | B．More than two hours. | C．About five hours. | D．About nine hours. |
| A．They do their homework. | B．They help parents do housework. |
| C．They watch TV and play computer games. | D．They do their homework and do some housework. |
| A．None of them. | B．85% of them. | C．58% of them. | D．All of them. |
| A．Today’s children do sports outdoors more than their parents did. |
| B．Today’s children play outdoors as much as their parents did. |
| C．Playing outdoors helps children stay active and healthy. |
| D．Playing outdoors brings the children safe problems. |
| A．Children today have more outdoor activities. |
| B．It’s helpful for children today to play outdoors often. |
| C．Children today don’t know what to play. |
| D．For parents, they should give the children free time. |
Comfort Zone is a state of mind where there is the least stress (压力). However, stepping into the learning zone can help to bring out the best in us. Here are the reasons.
▲ Challenging yourself can help you do at your best.
Stepping outside one’s comfort zone is important to personal development. How can we expect to make ourselves better if we only stick to habit and routine (日常)? We should try something we might not succeed at.
▲Taking risks is what helps us grow.
As children, we’re natural risk-takers. But as we get older and learn to fear failure (失败),we start trying fewer new things. We pay a heavy price for our fear of failure. There is no learning without some difficulty.
▲Facing new challenges can help us age better.
Our comfort zones seem to become smaller as we get older—but if we can keep expanding them, we’ll open ourselves up to a greater world as we age. As we step into the learning zone, we will get more comfortable with the skills gradually and we’ll start to move into the comfort zone. A study found that learning new life skills can help our brain stay sharp (敏锐的)as we get older.
However, don’t push yourself too far. Have you heard of “Yerkes-Dodson Law”? It means performance increases as stress grows, but only up to a point. If the level of stress becomes too high, performance will go down. When stress becomes too great for us to deal with, we enter the danger zone.
1. Compared with the comfort zone, people in the learning zone may ____________.| A．feel less stress | B．face more challenges |
| C．make fewer efforts | D．refuse more changes |
| A．spend money | B．fear failure | C．take risks | D．feel natural |
A． | B． |
C． | D． |
| A．Comfort Zone Makes Us Safe | B．What Is Comfort Zone |
| C．Step Outside Comfort Zone | D．Never Fear Comfort Zone |
【推荐3】Do you know about the eSports (电竞) game? It appeared in America in 1986. It was a game between two children on TV at that time. Then in 1998, a show about a popular video game appeared on TV in the Repubic of Korea.
The first eSports game became an official event at the 2023 Hangzhou Asian Games. It set up 7 major eSports events with 7 gold medals. However, the eSports game wasn’t popular with people before. Not everyone agreed that it was a kind of sport. They didn’t think it needed any physical power like other sports. Some people even thought it was a computer game. But it’s hard to be an excellent eSports player. First, it needs strong mental power (脑力). It can’t bring much fun to people. What’s more, the only thing the players do every day is practicing. Usually an eSports player has to spend over ten hours a day practicing on the computer.
Since China’s national team won first place in the eSports game in 2018, the eSports game has developed fast in China. According to a study, 38% of the young Chinese people under 26 years old want to work as eSports players. They think the work is very fun and exciting. As time flies, it has become common in China. Hangzhou has built a large eSports town. There’s an eSports park, an eSports school, an eSports-themed hotel and a training center. At the same time, more and more colleges have added eSports to their curriculums. More students from these colleges will work for eSports in the future.
Now eSports games are official sports in many countries. One day we might even see Sports games at the Olympic Games.
根据材料内容选择最佳答案。
1. When did the eSports game officially become an Asian Games event?
| A．In 1986. | B．In 1998. | C．In 2018. | D．In 2023. |
| A．Mental power and enough money. | B．Mental power and lots of practice. |
| C．Enough interest and talents. | D．Enough practice and a strong body. |
| A．Calendars. | B．Abilities. | C．Courses. | D．Scores. |
| A．The eSports games will soon appear at the Olympic Games. |
| B．Shanghai will be the center of China’s eSports games. |
| C．The eSports games have become increasingly popular in China. |
| D．Half of the young Chinese people want to be eSports players. |
| A．To introduce Hangzhou Asian Games’ eSports games. |
| B．To describe the difficulties of developing eSports games. |
| C．To tell us how to become an excellent eSports player. |
| D．To provide more information about eSports games. |
