Question

【題目】 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(液體) 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(新陳代謝) can make you uncomfortable. You may feel dizzy and become unconscious(無意識的), 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.240gB.200gC.1400gD.1680g

Answer 1

【答案】

【1】D

【2】C

【3】C

【4】B

【5】C

【解析】

本文屬于說明文閱讀。作者通過這篇文章向我們介紹了當我們鍛煉時脂肪的去向，它們會通過我們的呼吸轉(zhuǎn)變成二氧化碳，而最好的減肥方式就是少吃多鍛煉。

【1】細節(jié)理解題。根據(jù)“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.”可知，當我們鍛煉的時候大部分的脂肪通過我們的呼吸轉(zhuǎn)變成了二氧化碳。故選D。

【2】細節(jié)理解題。根據(jù)“Breathing more than the body’s metabolic rate(新陳代謝) can make you uncomfortable. You may feel dizzy and become unconscious(無意識的), according the study.”可知，呼吸超過身體代謝率會讓你感到不舒服。研究表明，你可能會感到頭暈，失去知覺。故選C。

【3】細節(jié)理解題。根據(jù)最后一段“So how to lose weight healthily? The key is to eat less and move more.”可知最好的減肥方式就是少吃多鍛煉。故選C。

【4】細節(jié)理解題。根據(jù)“the correct answer is that most of the mass is breathed out as carbon dioxide(二氧化碳).”正確的答案是，大部分物質(zhì)是以二氧化碳的形式呼出的�？芍�，減掉的大部分脂肪都是以二氧化碳的形式排出的。因此B正確；而“Some doctors think that fat is changed into heat and released in the air.脂肪轉(zhuǎn)化為熱量并釋放到空氣中。”的說法就是錯誤的。因為當我們鍛煉的時候大部分的脂肪通過我們的呼吸轉(zhuǎn)變成了二氧化碳。因此A不對；根據(jù)“None of this is obvious to people because we can’t see the carbon dioxide gas we breathe out,” said Meerman.”米爾曼說：“這些對人們來說都不明顯，因為我們看不到呼出的二氧化碳氣體�！薄？芍�C不對；根據(jù)“Breathing more than the body’s metabolic rate(新陳代謝) can make you uncomfortable.”呼吸超過身體代謝率會讓你感到不舒服。可知D不對。故正確的是B。

【5】細節(jié)理解題。根據(jù)“During a day, a 70kg person breathes out about 200g of carbon dioxide.”一天中，一個70公斤重的人呼出約200克二氧化碳�？芍�，一周內(nèi)，一個70公斤重的人呼吸出1400g（200克x7=1400克）二氧化碳？ 故選C。