When we exercise hard, we burn fat. But have you ever wondered where exactly the fat goes?
Some doctors think that fat is changed into heat and given off in the air. Others think the body burns it. Some even joke that someone comes and takes it. That’s why you always weigh less in the morning.
Now a new study from Australia solves the mystery (迷). “The correct answer is that most of the fat is breathed (呼吸) out as CO2. It goes into the air.” says the study.
Scientists followed the atoms (原子) in 10 kilograms of fat as they are lost. They found that 8.4 of those kilograms are breathed out as CO2 through the lungs (肺). The other weight, 1.6 kilograms, becomes water and leaves the body.
“None of this is easy to understand because we can’t see the CO2 we breathe out.” said the study’s lead expert.
Does that mean you can lose more weight by breathing more? It is not as easy as you think.
Breathing more than the body’s metabolic rate (新陈代谢速度) can make you uncomfortable. You may feel dizzy (眩晕的) and become unable to see, move or feel, according to the study.
So how can people lose weight healthily? The key is to eat less and move more. You may have heard this many times. During a day, a 70kg person breathes out about 200g of CO2. So if the same person wants to lose weight, he or she can do some light exercise, for example, walking fast. This can help lose 240g of CO2.
1. Where is the new study from?| A．Japan. | B．Australia. | C．Canada. | D．America. |
| A．The body burns it. | B．Someone comes and takes it. |
| C．It is changed into heat and given off in the air. | D．Most of it is breathed out as CO2. |
| A．They will lose weight healthily. | B．They will feel comfortable. |
| C．They may become unable to move. | D．They may become healthier. |
| A．Sitting still and breathing more. | B．Sleeping a lot and breathing more. |
| C．Eating less and exercising more. | D．Eating more and doing some light exercise. |
| A．where fat goes when we exercise | B．why we can lose weight healthily |
| C．how we should do some exercise | D．what we should do to become fat |
相似题推荐
【推荐1】Many people today like exercise. Some like to run, and some like to walk. Others dance or play balls. They do different kinds of exercise. Why do people like exercising? It’s good for their health. And exercise helps make them tired, so they sleep better at night.
You may like to run. If you do, take care of your feet. Make sure you have the right shoes. Some people like to run on roads, but they must watch out for cars.
Walking is a good exercise. You may take a long walk in the park. It’s more fun if you don’t go alone. Go with a friend. The two of you may have a great time.
Some people like to swim. But others don’t like to go into the water. If you like this kind of exercise, make sure that someone is watching you. You must always take care when you are in the water. Jumping a rope (跳绳) or riding a bike is also good exercise. There are many other exercises. Find out what you like. You may need help at first. Some people often do exercise, and they can help you. Do exercise every day, and you will know what it makes you feel.
1. The passage tells us about ________.| A．Running | B．swimming | C．Walking | D．exercise |
| A．have the right shoes | B．run fast on the roads |
| C．go with a friend | D．let someone watch you |
| A．向外看 | B．接近 | C．当心，小心 | D．担心 |
【推荐2】It is very important for us to exercise to stay healthy. How should we exercise to keep fit?
Depending on(取决于) your personal fitness goals(目标), how often you should exercise will be different. But it's important to work your way up to the minimum amount(最低量) of 150 minutes of moderate(适度的) exercise every week.
Exercising too hard or too often can cause injuries. And if you exercise too much, the soreness(疼痛) you feel may make you give up exercise all together.
Here is how to get an idea of a starting off point:
★Write down how much exercise you get now each day, even if it's walking. Walking is exercise, too.
★Decide on what kind of exercise you are going to do. Will you do cardio(有氧运动), weight training, or other sports?
★Check out the minimum for cardio and weight training. What's the minimum of that you can do each week.
★Make an exercise plan. It could be something as simple as walking around the street each day.
Start off with exercise that you love to do now!
1. How often you should exercise depend on ________.| A．whether you are a beginner | B．what your personal fitness goals are |
| C．what your weight is | D．what kind of sport do you like |
| A．体魄 | B．健身 | C．受伤 | D．疾病 |
| A．Four | B．Five | C．Six | D．Seven |
| A．It's important to exercise | B．How to get an idea of a starting off point |
| C．Let's exercise to keep healthy | D．why do we exercise |
【推荐3】It’s interesting to go out and relax. There are many outdoor activities. Here are some of them.
◆Swimming. It’s easy to find a nice swimming place. Swimming in a river or the sea can be more fun.
◆Riding bikes together. It’s cool and fun on a bike.
◆Looking for birds and animals. You can read books about animals and see if you can find them.
◆Playing games outdoors.
◆Looking at the stars. You can sit on the grass and enjoy the beautiful stars when you feel tired. Watch shooting stars (流星) and make a wish.
◆Dancing in the rain. It isn’t always sunny, but you can have fun playing in the rain. But don’t go out when there’s thunder and lightning (雷和闪电).
Just relax and enjoy the time. You’re outdoors only a few times a year. Just enjoy it.
根据短文内容，判断下列句子正（T）、误（F）。
1. The writer thinks swimming is an interesting outdoor activity.
2. We look for birds and animals to keep them at home.
3. We can feel relaxed when we watch the stars at night.
4. It’s fun and safe to dance and play games in the rain when there’s thunder and lightning.
5. Doing outdoor activities is good for us.
【推荐1】How much sleep do we need? We are all different. Some people need only three hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average (平均) of seven to eight hours a night. After the age of fifty, the average sleep time goes down to 6.5 hours a night.
Most people have a bad night when they can not sleep. About one in three Americans has a problem with sleep. Many of these people can not fall asleep. This problem is called insomnia. This is not a new problem. Many famous people in history had insomnia. Some of these people had special (特别的) ideas to make themselves sleep. Benjamin Franklin, the famous statesman(政治家) and inventor(发明家), had four beds. He moved from one to another to fall asleep. King Louis XIV of France had 413 beds and hoped that he could fall asleep in one of them. Mark Twain, the famous American writer, had a different way. He lay on his side on the end of the bed!
1. Most American people need ________ hours of sleep a night.| A．3 | B．10 | C．7-8 | D．5-6 |
| A．more | B．less | C．no | D．little |
| A．going to sleep easily | B．sleep in the daytime |
| C．the ways of sleep | D．not being able to fall asleep |
| A．was an old man | B．thought it was easy to go to sleep |
| C．was a famous writer | D．didn’t have much room to sleep in |
| A．sleep | B．insomnia | C．how to get to sleep | D．the famous person |
Has anyone ever told you that eating carrots will help you see in the dark? This is just one of many incorrect beliefs you may have heard. Below, TEENS has picked out scientific explanations for three mistakes that people make about their eyes. Let’s take a look.
Can eating carrots improve your eyesight? Carrots are rich in vitamin A, which helps the eyes to turn light into information for your brain. This allows people to see in darker places. However, eating more carrots won’t help you see better. A certain minimum(最低的) amount will help, but a large number of carrots will not give you superhuman vision.
If your parents have bad eyesight, will you have bad eyesight, too? Myopia(近视) can be passed from parents to children. A study by the American Optometric Association found that if both parents are myopic, there’s a 33 to 60 percent chance that their child will be. For children who have one parent with myopia, the chance is 23 to 40 percent, and it’s down to 6 to 15 percent for kids with non-myopic parents. So if your eyesight is bad, your children might still have good vision.
Do color blind people see the world in black and white? Color blindness doesn’t usually mean that people see the world like an old movie. They usually can’t tell certain colors apart, especially green and red. Another commonly confused pair of colors is yellow and blue. Our eyes have cone cells(视锥细胞) that sense different wavelengths(波长) of light. If these cells don’t work properly, color blindness occurs(发生). There are different levels of color blindness. Some people are only color blind in low light. However, in the most serious form of color blindness, everything is shades of gray.
根据以上短文内容判断正误，正确的用“A”表示，错误的用“B”表示。
1. Vitamin A can help the eyes to turn light into information for the brain.
2. Eating a large number of carrots will help you see things better.
3. If both parents have myopia, their child’s chance of having good eyesight is 40-67 percent.
4. Changes in the wavelength of light is the cause of color blindness.
5. The purpose of the passage is to clear up some misunderstandings about our eyes.
【推荐3】Last year was the 100th anniversary （纪念日） of the discovery of insulin （胰岛素）. Before 1921, children and adults with diabetes （糖尿病） most often died within a few days or months. Insulin can make this timeline last for more years.
Back in the 16th century, there were records about this“terrible disease”. People got much pain from sickness, too much thirst and so on, and soon died in pain. These were all caused by high levels of blood sugar. For thousands of years, humans didn’t know how to deal with it. This changed in the 1880s. That’s when scientists found a special thing named insulin. It controls blood sugar. But scientists didn’t know how to get it.
In 1921, Frederick Banting came up with an idea. The Canadian doctor asked his friend to provide him with a lab, and worked tirelessly on 10 dogs. Soon after, he successfully took out insulin from a dog and used it to treat another dog with diabetes. To his surprise, the insulin made its blood sugar levels go back to normal. Later, Banting and Scottish scientist John Macleod made a more purified （提纯的） form of insulin. They used it to successfully treat a 14-year-old boy who was dying from diabetes.
In 1923, Banting and Macleod received the Nobel Prize in Physiology or Medicine. To help people get the medicine easily, they sold the patent （专利） for just one dollar. As Banting said, “Insulin belongs to the world, not to me.”
Today, there are more than 400 million people with diabetes around the world. Insulin gives them a fighting chance to live.
根据材料内容选择最佳答案。
1. With the insulin, diabetes patients ________.
| A．can keep away from diabetes |
| B．may find other diseases soon |
| C．can avoid dying in a short time |
| D．may experience great pain every day |
a. Sickness. b. Feeling cold. c. Very thirsty. d. Too much hunger.
| A．ab | B．bd | C．ac | D．ad |
| A．Because it failed in animal tests. |
| B．Because there was no way to get it. |
| C．Because no one paid attention to diabetes. |
| D．Because people didn’t trust the new treatment. |
| A．Why insulin could help treat diabetes. |
| B．How much scientists got from insulin. |
| C．How scientists got insulin for treating patients. |
| D．What failures scientists experienced while studying insulin. |
| A．Because they wanted to get the Nobel Prize. |
| B．Because they wanted to help more diabetes patients. |
| C．Because their findings were based on others’ research. |
| D．Because insulin was too expensive to afford for patients. |
【推荐1】A healthy eating habit along with exercise can help you keep healthy. When you are young, it is important to give your body what it needs. If you skip meals, you can't get enough calories（热量）. And then you may feel tired. By the way, the calorie is just another word for energy. About 50% of your calories should come from rice, bread, vegetables and fruit. You also need to drink a lot of water, 6 to 8 glasses a day. Drinking water can make your body work well and make you healthy.
Exercise can help to make you look good, feel good and be healthy. Scientists say that kids should spend at least 30 minutes exercising a day, five times a week. It is easy to do! You can walk or ride your bike to school, and play sports at school. However, kids often give up sports, saying they have no time left after finishing their homework. In fact, doing exercise can help them sleep better and do better in their lessons.
If you follow the advice above, you will look and feel much better and become healthy.
1. The underlined word "skip" means "________" in Chinese.| A．询问 | B．略过 | C．阻止 | D．转移 |
| A．Because they are too lazy to exercise. |
| B．Because they feel great after giving up sports. |
| C．Because they are busy with their studies. |
| D．Because they don't like playing sports at all. |
| A．About 80% of your calories should come from rice, bread, vegetables and fruit. |
| B．You need to drink three to four glasses of water every day to keep healthy. |
| C．Students should exercise at least twice a week to keep healthy and happy. |
| D．Doing exercise can help kids sleep better and do better in their lessons. |
| A．How to eat healthily. | B．How to exercise. |
| C．How to look thinner. | D．How to keep healthy. |
【推荐2】
Concept cars (概念车) are model cars created by car makers to show new ideas and designs. With concept cars, the future has never looked so beautiful. Even though most of us can’t afford such unbelievable cars, we still like their beautiful design and, if they were built, we would love to see them on the streets.
Car makers create innovative (创新的) designs which pave the way for their future goals. However, most concept cars may never go into production. They serve as a source of inspiration (灵感) and creativity for future models. Cool concept cars are often displayed at shows in order to receive suggestions from customers. Then, the designers can improve their plans and technologies.
In recent times, cars are often valued for being practical, safe, and affordable. As the suburbs (郊区) have grown, many people have to spend more time on their way to work. This change has made cars become more important. However, some people have argued that cars in recent years have also become overly boring.
Have our cars become boring? Have we lost the innovation Henry Ford once showed? The futuristic designs of the 1970s have become a thing of the past, and popular standard models are often short of imagination. However, there is a wide range of concept cars that have been produced. Some were wild and crazy, and some of them never made it. However, concept cars pave the way for the future.
1. What do we know about concept cars?| A．They are very cheap. |
| B．They are popular for their looks. |
| C．They are model cars to show innovation. |
| A．To improve their sales. |
| B．To collect customers’ advice. |
| C．To test the performance of cars. |
| A．They are not practical. |
| B．They are not safe enough. |
| C．They are short of creativity. |
| A．bright | B．hopeless | C．uncertain |
What are you going to do if you are in a burning house? How will you escape? Do you know how to save yourself? Please read the following passage.
Escaping from a fire is a serious matter. Knowing what to do during a fire can save your life. It’s important to know the ways you can use and show them to everyone in the family, such as stairways and fire escapes, but not elevators.
From the lower floors of the buildings, escaping through windows is possible. Learn the best way of leaving by windows with the least chance of serious injury.
The second floor window is usually not very high from the ground. Of course, it is safer to jump a short way than to stay in a burning building.
Windows are also useful when you are waiting for help. Be sure to keep the door closed. Or smoke and fire may come into the room. Keep your head low at the window to be sure you get fresh air rather than smoke that may get into the room.
On a second or third floor, the best windows for escape are those that open onto a roof . From the roof a person can drop to the ground more safely. Dropping onto hard ground might end in injury. But shes and grass can help to break a fall.
1. It’s serious to know how to escape from a fire.
2. In a fire we can use elevators to come down.
3. Windows can’t be used when you are waiting for help.
4. Doors must all be open so that smoke can come into the room.
5. The passage may help save your life in a fire.
