大学英语快速阅读第三版2电子版.doc
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1、6.A Long and Healthy LifeHave you wished for a magic pill or magic formula (方法) that would let you live happily forever ? If you have, dont feel alone! Its a very mon, natural wish that has a long history. Spanish explorers of the sixteenth century even tried to find a fountain of youth in what is n
2、ow the state of Florida. The water of this legendary (传说中的) fountain, which no one has yet found ,was believed to restore youth and good health to those who drank it. Biologists today dont expect that anyone will find a magical fountain of youth. Growing older is a natural part of the life cycle tha
3、t cant be reversed(倒退) .As human beings grow older ,organs such as the heart and lungs may stop functioning properly. Sight and hearing may bee weak .And the human body bees more likely to e down with serious illness from which it cannot recover.Considered together, changes that bring about the decl
4、ine(衰退) of an organism are called aging .Because of aging ,many biologists believe that there may be a maximum(最大的) age limit to which even the healthiest organisms can live. For human beings, this maximum age limit is about 110 years.Perhaps the most important thing that you can learn from your stu
5、dy of human biology is that you have a lot of control over the aging process in your own life .In fact; within our control are many physical and mental factors that have much to do with aging. For example ,each of us ,as recent research indicates, can do many things to help prevent heart and vessel(
6、血管) disease ,which causes half the deaths each year in the United States .We can avoid eating a lot of fatty meat. Eating too much of these types of animal fats can lead to the clogging(阻塞) and hardening of blood vessels . We can cut back on smoking and hopefully of sugar we eat. We can exercise reg
7、ularly and strengthen the heart and other organs. And we can remember to take time out each day for ourselves, time just to relax. Exercise ,recreation(娱乐), and relaxation all reduce stressinner tension that is hard on all body organs. One final thing we can do is to try to keep aware of advances ma
8、de in health education. Information is often available free of charge from health clinics or schools. (406 words)prehension Exercises. Choose the best answers to the following questions.1. Which of the following is the leading cause of death in the United States? A. Heart disease. B. Cancer. C. Alco
9、hol. D. Smoking. 2. What happens as people grow older?A. They dream of a magic pill to help them live a happy and long time.B. They e down with serious illnesses.C. Their organs bee weak and may stop working properly.D. Their blood vessels bee clogged.3. In the opinion of biologists,.A. the aging pr
10、ocess can be reversedB. the aging process can be controlled and slowed down C. the aging process can be got rid of D. the aging process can go beyond its limit4. We can slow down the weakening of all our body organs by.A. not eating animal fat B. limiting drinking and smoking C. exercise, recreation
11、 and relaxation to blood vesselsD. preventing the clogging and hardening of blood vessels5. Besides physical and mental factors, which of the following also contributes to living a long and healthy life according to the passage?A. Health education.B. Traditional medicine. C. Artificial organs.D. The
12、 invention of magic pills. Judge whether or not the following statements agree with the information given in the passage,and mark Y for YES,N for NO ,or NG if information is not given in the passage.( ) 1.Few people have the wish of finding a magic pill that would be of help to live happily forever.
13、( ) 2.Many biologists believe that each species has a natural maximum age limit.( ) 3.From the passage we know that there is much we can do to help prevent many diseases.( ) 4.Mental factors have little to do with good health.( ) 5.Doctors believes that regular exercise reduces the chances of gettin
14、g heart disease.7.The Earths Past If the history of the earth could be pressed (压缩)into the span of one years time,the story of the human race would be written as the the last two hours of the final day!This fact gives you an idea of just how old the Earth is no written record to tell us the Earths
15、geological past ,the Earth has left a record in the form of fossils. A fossil is the preserved remains or traced of an ancient living thing.Fossils are most often found buried in rock,but they may bones,shells,and woodyalso be found in caves,ancient tar(沥青) beds,and the solid ice that covered the Ea
16、rths polar regions.In all these places,fossils are protected from damaging effects of weathering and erosion(侵蚀). Usually only the hard parts are preserved.The hard part can include ones,shells,and woody tissues.The soft parts,like flesh,either decay or are eaten by animals before they can be preser
17、ved.One exception is when an organism is subjected to extreme cold.Then the entire body may be preserved in ice. Sometimes the remains of an organism are preserved after after having been changed into a pletely different form.For instance,coal deposits on the Earth are actually the fossil remains of
18、 plants.When plants depose(腐烂),eventually only deposits of carbon remain.When the carbon is under extreme pressure for a long period of time,it is slowly transformed into coal.Coal is called afossil fuelbecause of the way it is created. Fossils can help geologists(地质学家)learn about how animal and pla
19、nt species have changed over time.Since geologists can date the rocks that the fossils are in,they can also tell during what time period in the past a species lived.For example,on the geologic calendar,you can see that fish first appear in the era labeled Paleozoic(古生代).This means that the oldest ro
20、cks discovered to contain fish fossils are between 225 million and 600 million years old.We can assume that fish existed in the world at least 225 million years ago. Fossils are also used to study extinct(灭绝的) species.There are no longer any living woolly mammoths(猛犸) on the Earth,but we can know wh
21、at a woolly mammoth looked like by studing the frozen bodies found in Siberia. (406 words)prehension Exercises.Choose the best answers to the following question. 1.How old is the Earth? A.Over 225 million years. B.Over 600 million years. C.Between 225 and 600 million years. D.Over 4 billion years. 2
22、.We know the age of the life on the Earth because _. A.there is written record of the Earths geological past B.some fossils are found in good shape. C.the earth contains a record in the form of fosssils. D.some scientists have studied some extinct animals 3.Where can we find fossils besides in rock
23、and caves? A.In water. B.In woody tissues. C.In solid ice. D.In coal. 4.How is coal created? A.The remains of dead plants are transformed into deposits of coal under extreme pressure over a long time. B.The remains of dead animals have been changed into a pleted different form. C.Rocks and tar beds
24、have bee different form over time.n changed into a pletely different form over time. D.The soft parts of organisms have been changed into a pletely different form. 5.Fossils are usually found in rock,caves,ice and so on.Why? A.Because these are the places where fossils can form. B.Because these are
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- 大学 英语 快速 阅读 第三 电子版
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