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 released in the air. Others think the body burns it. Some even joke that the fat fairy comes and takes it. That is why you always weigh less in the morning.

Now a new study from the University of New South Wales in Australia reveals the mystery. “the correct answer is that most of the mass is breathed out as carbon dioxide(二氧化碳). It goes into thin air,” says the study’s lead author, Ruben Meerman, to Science Daily. 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 carbon dioxide through the lungs. The rest of the weight —1.6 kilograms— becomes water that leaves the body in the form of fluids(液体) such as urine(尿), sweat, breath and tears. “None of this is obvious to people because we can’t see the carbon dioxide gas we breathe out,” said Meerman.

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) can make you uncomfortable. You may feel dizzy and become unconscious(无意识的), according the study. So how to lose weight healthily? The key is to eat less and move more. You many have heard this many times.

During a day, a 70kg person breathes out about 200g of carbon dioxide. So if the same person wants to lose weight, he or she can do some light exercise, for example, jogging. This can help lose 240g of carbon dioxide.

1.According to the new study, where does our fat go when we exercise a lot?

A.It is changed into heat and given off in the air. B.The body burns it.

C.The fat fairy comes and takes it. D.Most of it is breathed out as carbon dioxide.

2.What will happen to people if they breathe more than the body’s metabolic rate?

A.They will put on more weight. B.They will feel comfortable.

C.They may become unconscious. D.They may not lose weight at all.

3.Which of the following is a better way to lose weight?

A.Sitting still and breathing more. B.Sleeping a lot and breathing a lot.

C.Eating less and exercising more. D.Eating more and doing some light exercise.

4.Which is true according to the study from University of New South Wales?

A.The fat is changed into heat and released in the air.

B.Most of the kilograms of fat as they are lost are breathed out as carbon dioxide.

C.People can see the carbon dioxide gas we breathe out.

D.If we breathe more than the body’s metabolic rate, we will feel good.

5.During a week , how much carbon dioxide does a 70kg person breathes out?

A.240g B.200g C.1400g D.1680g

Different countries have different ideas about how to be polite. In Britain, table manners are important. But how do you show good table manners in Britain? Here is some advice:

How to sit: You should sit up straight in your chair. When you eat, don’t pick up the bowl. This is called very bad manners.

Noises at the table: It is never a good idea to make a noise at the table.

Using your fingers: 62Usually we don’t pick food up with our fingers when we are eating main dishes. But there are some foods such as pizza, sandwiches, chips and fruit we can eat with fingers.

Passing things: If someone asks you to pass something like the salt, only get it if you are the closest person to it. Never lean (倾斜, 倾倒) across someone else’s food. It’s more polite not to use it yourself first --- pass it directly to the person who asked, and then use it later. It’s best to taste your food before you put salt in it.

Your mouth: 63 It is not polite to talk with your mouth full of food, nor to eat with your mouth open.

How much to eat: It is polite to eat up the food that you have been offered, so a clear plate is a good plate. It shows that you enjoy the food. If you can’t finish everything and you can leave a little, that is okay. You could say something like “That was very nice, thank you.”

(一)根据短文内容简要回答问题。

How should you sit when you eat in Britain?

1.

What shows that you like the food?

2.

(二)将短文中划线的句子译成汉语。

3.

4.

(三)请给短文拟一个适当的题目。

5.

There was once a very wide tree in South Africa. 60 people could stand in its hollow trunk(空心树干). The tree reached over 18 meters into the sky and it was more than 1, 100 years old. But recently, that tree and others like it have died.1.

The tree was a baobab(猴面包树). Baobab trees grow in Africa and are called"the Tree of Life”.

Baobab trees usually live a long time. One of the oldest stood for more than 2, 400 years.

2.They noticed that nine of the thirteen oldest baobab trees and five of the six largest died in the following 12 years.

Stephan Woodborne, one of the six scientists, says more research(研究)is needed to know why the trees died.3.That's because the trees clearly weren't sick. Besides, many were in national parks, so they were protected from human activities. They believe that increasing temperatures and changing rainy seasons have made it harder for baobabs to live.

"The big ones and the old ones caught the attention of people, Woodborne says. "But it's not just those. 4.People should be more environment-friendly. It is one way to help protect baobabs and other trees from the effects of climate change, according to Woodborne. 5.

“We need to think about the way we live our lives. "Woodborne says. "If we all change what we do a little bit, it will start to make a difference.”

A.That could mean using less energy(能源) and making less waste(废料), when possible.

B.Smaller and younger baobabs are dying too.

C.However, they think climate change may be the main reason.

D.Scientists are wondering why.

E.In 2005, scientists began a research to find out the age of more than 60 baobabs.

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网