Question

15．When we exercise hard，we burn fat （脂肪）．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．
"The correct answer is that most of the fat is breathed out as CO₂．It goes into thin 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，bccomes 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 24Og of CO₂．

根据短文内容．选择圾佳答案．
36．Where is the new study from？B
A．Japan．
B．Australia．
C．Canada．
D．America．
37．According to the new study，where does our fat go when we exercise a lot？D
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．
38．What will happen to people if they breathe more than the body's metabolic rate？C
A．They will lose weight healthily．
B．They will feel comfortable．
C．They may become unable to move．
D．They may becomc healthier．
39．Which of the following is the best way to lose weight？C
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．
40．The passage mainly tells usA．
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 burn fat．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章向我们介绍了当我们锻炼时脂肪的去向，它们会通过我们的呼吸转变成二氧化碳，而最好的减肥方式就是少吃多锻炼．

解答 36．B  细节理解题，根据第三段Now a new study from Australia solves the mystery．可知这项新的研究来自于澳大利亚，故选B．
37．D  细节理解题，根据第四段The correct answer is that most of the fat is breathed out as CO2．It goes into thin air，"says the study可知当我们锻炼的时候大部分的脂肪通过我们的呼吸转变成了二氧化碳，故选D．
38．C  细节理解题，根据倒数第二段．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．可知如果人们的呼吸速率比身体的新陈代谢速率快，那么你会感到不舒服，头晕，甚至不能移动，故选C．
39．C  细节理解题，根据最后一段So how can people lose weight healthily？The key is to eat less and move more．可知最好的减肥方式就是少吃多锻炼，故选C．
40．A  主旨大意题，根据第一段When we exercise hard，we burn fat （脂肪）．But have you ever wondered where exactly the fat goes并通读全文可知这篇文章主要向我们介绍了我们锻炼时脂肪都去哪了，故选A．

点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．