Ifyourjobrequiresalotofsitting-优题课

DNA ( Deoxyribonucleic acid ) is one of the most important discoveries in science. DNA is the plan for the human being , as a blueprint is the plan for building. DNA makes a person look the way he does. A person's DNA. comes from a mixing of his parents' DNA. That's why a child looks like his parents. But, besides controlling things such as height and hair color, DNA can also give people diseases , Scientists are now studying DNA to cure diseases.
In the seventies, scientists developed a process called recombinant (重新组合) or RDNA. Although it sounds difficult to understand, RDNA simply means taking DNA from one animal or plant and putting it into another. By doing so, scientists can create new beings. In so doing, scientists can better understand DNA, especially what parts of DNA do . After they understand DNA, scientists can begin to cure diseases. Often, the new being created will itself be the cure.
Besides curing diseases, RDNA research can also do other things. For example, scientists in Japan have already created “super-trees”. Trees help humans, because they take CO₂, which poisons humans, from the air and turns it into oxygen, which lets humans breathe. “Super-trees” do this too, but do if much faster. As things such as cars and factories have already put much CO₂ in the area, “super-trees” are badly needed.
Unfortunately, there is serious danger in RDNA research. Scientists want to create animals to cure old diseases, but these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural, they may let loose many new powerful diseases.
As a result, RDNA research will create many solutions (解决方案), but it will also create many problems.
67. From the passage, we can know that a boy looks like his parents because________
A. he is son of his parents
B. his parents' DNA decides his appearance
C. he has received DNA from his father or his mother
D. scientists have put some of his parents' DNA into him
68. What does the underlined expression “let loose” probably mean?
A. let... go free B. get rid of C. absorb D. survive
69. What is the best title for the passage?
A.The DNA Research in Japan
B. A New Way of DNA Research in Japan
C. The Causes and Effects of DNA Research
D. The Advantages And Disadvantages of RDNA
70. The following statements are true about RDNA research EXCEPT_____.
A. the research has been stopped because the created animals carry virus
B. “super-trees” might be widely planted around the world
C. scientists have not completely understood DNA
D. RDNA research will benefit human beings a lot

This chart shows the top 10 songs from TOP HITS HOT 100 of the week ending July 8,2003.

This Week	1 Week Ago	2 Weeks Ago	3 Weeks Ago	Title	Performer, Lyricist, Producer, Record Company	Weeks on Chart
1	3	5	9	BACK FOR GOOD	Take That G Barlow Chris Poter And Gary Arlow BMG	10
2	2	1	2	RUN AWAY	The Real McCoy J Wind, Oickmix, Jeglitzs Fresh Line And Bermarr Brothers MBG	11
3	1	2	3	HERE’S JOHNNY	Hoeus Pocus Xtro And Cubrick Xtro And Cubrick Central Station Records	9
4	4	3	5	TOTAL ECLIPSE OF THE HEART	Nieki French Jim Steiman J Spingate Shock	10
5	5	4	1	THINK TWICE	Celine Dion A Hill And P Sinfild Christopher Neil Sony	12
6	9	12	14	SUKIYA KI	4 Pm H Nakamura Veit Renn Folygram	3
7	8	17	19	MOUTH	Merril Bainbridge Ross Fraser George Siewooi And Owen Boeweell BMG	8
8	19	31	77	EVERYB ODY ON THE FLOOR	Tokyo Ghetto Pussy Tokyo Ghetto Pussy Trancy Spacer Stony Records	4
9	6	9	13	COTTO N EYE JOE	Rednex Jan Ericsson Pat Reiniz BMG	107
10	14	14	34	STRON G ENOUG H	Sheryl Crow, David Baerwald, Kevin Gilbert, David Rickett＆Brain Macleod Bill Bottrell Polygram	7

63．The song that has risen most in the chart over the three weeks is.
A．Mouth B．Cotton Eye Joe
C．Strong Enough D．Everybody on the Floor
64．Which song has been in the chart for the longest period?
A．Back for the Good B．Cotton Eye Joe
C．SUKIYAKJ D．Strong Enough
65．The performer who had the song with best rank two weeks ago is .
A．Merril Bainbridge B．H Nakamura
C．The Real McCoy D．Tokyo Ghetto Pussy
66．The chart shows that Mouth is.
A．becoming less popular each week B．becoming more popular each week
C．the most popular song on the chart D．as popular as when it entered the chart

Indians Refuse Higher Education
On June 17,1744, the officials from Maryland and Virginia held a talk with the Indians of the Six Nations． The Indians were invited to send boys to William and Mary College． In letter the next day they refused the offer as follows:
We know that you have a high opinion of the kind of learning taught in your colleges, and that the costs of living of our young men, while with you, would be very expensive to you． We are certain that you mean to do us good by your suggestion; and we thank you heartily． But you must know that different nations have different ways of looking at things, and you will therefore not be displeased if our ideas of this kind of education happen not to be the same as yours． We have had some experience of it． Several of our young people were formerly brought up at the colleges of the northern provinces:
They were taught all your sciences; but, when they came back to us, they were bad manners, and they knew little of every means of living in the woods．．． they were totally good for nothing．
We are, however, not the less obliged for your kind offer, though we refuse to accept it; and, to show our grateful sense of it, if the gentlemen of Virginia will send us a dozen of their sons, we will take care of their education, teach them in all we know, and make men of them．
59．The passage is about _______．
A．the talk between the Indians and the officials
B．the colleges of the northern provinces
C．the educational values of the Indians
D．the problems of the Americans in the mid-eighteenth century
60．The Indians’ chief purpose in writing the letter seems to be to______．
A．politely refuse a friendly offer
B．express their opinions on equal treatment
C．show their pride
D．describe Indian customs
61．Different from the officials’ view of education, the Indians thought______．
A．young women should also be educated
B．they had different objects of education
C．they taught different branches of science
D．they should teach the sons of the officials first
62．The mood of the letter as a whole is best described as ______．
A．angry B．politeC．pleasant D．inquiring

Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, winter skating or skiing in winter. It may be a game of some kind, football, hockey, golf or tennis. It may be mountaineering（爬山）.
Those who have a passion（热情）for climbing high and difficult mountains are often looked upon with astonishment. Why are men and women willing to suffer cold and hardship, and to take risks on high mountains? This astonishment is caused probably by the difference between mountaineering and other forms of activity to which men give their leisure.
Mountaineering is a sport and not a game. There are no man-made rules, as there are for such games as golf and football. There are, of course, rules of a different thing that it would be dangerous to ignore（忽视），but it is this freedom from man-made rules that makes mountaineering attractive to many people. Those who climb mountains are free to use their own methods.
If we compare mountaineering and other more familiar sports, we might think that one big difference is that mountaineering is not a “team game”. We should be mistaken in this. There are, it is true, no“matches”between“teams”of climbers, but when climbers are on a rock face linked by a rope on which their lives may depend, there is obviously teamwork.
The mountain climber knows that he may have to fight forces that are stronger and more powerful than men. He has to fight the forces of nature. His sport requires high mental and physical qualities
A mountain climber continues to improve in skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions are in their early twenties. But it is not unusual for a man of fifty or sixty to climb the highest mountains in the Alps. They may take more time than younger men, but they probably climb with more skill and less waste of efforts and they certainly experience equal enjoyment.
55．Mountaineering involves .
A．cold B．hardship C．physical risk D．all of the above
56．The difference between a sport and a game has something to do with the kind of .
A. activity B. rules C. uniform D. participants
57．Mountaineering can be called a team sport because .
A．it is an Olympic event
B．teams compete against each other
C．mountaineers depend on each other while climbing
D．there are 5 climbers on each team.
58．Which is the best title for the passage?
A．Mountaineering Is Different from Golf and Football k
B．Mountaineering Is More Attractive than Other Sports
C．Mountaineering
D．Mountain Climbers

What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is “no”. It is not the tools a scientist uses but how he uses these tools that makes him a scientist. You will probably agree that knowing how to use a power is important to a carpenter. You will probably agree, too, that knowing how to investigate(调查),how to discover information, is important to everyone. The scientist, however, goes one step further, he must be sure that he has a reasonable answer to his questions and that his answer can be confirmed by other persons. He also works to fit the answers he gets to many questions into a large set of ideas about how the world works
The scientist’s knowledge must be exact. There is no room for half right or right just half the time. He must be as nearly right as the conditions permit. What works under one set of conditions at one time must work under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration must be explained by the changes in the conditions. This is one reason that investigations are important in science. Albert Einstein, who developed the theory of relativity, arrived at this theory through mathematics. The accuracy of his mathematics was later tested through investigations. Einstein’s ideas were shown to be correct. A scientist uses many tools for measurements. Then the measurements are used to make mathematical calculations that may test his investigations.
51.What makes a scientist according to the passage?
A.The tools he uses. B. His ways of learning.
C.The way he uses his tools. D.The various tools he use
52.“The scientist, however, goes one step further,” the author says this to show 。
A.the importance of information
B. the importance of thinking
C. the difference between scientists and ordinary people
D. the difference between carpenters and people with other jobs.
53. A sound scientific theory should be one that .
A. does not only work under one set of conditions at one time, but also works under the same conditions at other times
B. leaves no room for improvement
C. does not allow any change even under different conditions
D. can be used for many purposes
54. What is the main idea of the passage?
A.Scientists are different from ordinary people.
B.The theory of relativity.
C.Exactness is the core（核心）of science.
D.Exactness and way of using tools are the keys to the making of a scientist.

A．using a standing desk	B．resting one's muscles
C．quitting sedentary jobs	D．taking a walk while discussing

A．Things being discussed.	B．People being studied.
C．Areas of knowledge being learned.	D．Objects being painted.