Ahealthydoseofsunshinemaybethe

更新 2022-09-03
科目英语
题型阅读理解
难度容易
浏览 542

A healthy dose of sunshine may be the secret to staying young, British scientists have disclosed.
Vitamin D is produced naturally by the skin in response to sunlight and may help to slow the ageing process and protect against heart disease, according to the study.
Researchers from King's College London studied 2,160 women aged between 18 and 79, looking at their telomeres - a biological marker of ageing found in DNA．As people get older, their telomeres get shorter and they are easy to have illnesses.
But the study found women with high levels of vitamin D had comparatively longer telomeres - a sign of being biologically younger and healthier.
The study suggests vitamin D may help to slow down the ageing process of DNA, and therefore the ageing process as a whole.
Lead researcher Dr Brent Richards said: "These results are exciting because they prove for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D．
"This could help to explain how vitamin D has a protective effect on many ageing related diseases, such as heart disease and cancer."
He said further studies are required to confirm the findings.
Professor Tim Spector, head of KCL's twin research unit, and a co-author of the report, added: "Although it might sound absurd(荒谬的), it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process."
Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.
Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.
64．What’s the best title of this passage?
A．Sunshine 'helps to keep you young'
B．Vitamin D has a protective effect on many diseases
C．Telomeres - a biological marker of ageing
D．People have found the secret to having a long life
65．How can people get vitamin D?
A．through water B．through sunshine
C．through food D．both B and C
66．What does the underlined word in paragraph three refer to?
A．It refers to a kind of vitamin that can keep you young.
B．It refers to a biological marker of ageing found in DNA.
C．It refers to a kind of element that can be obtained from sunshine.
D．It refers to a part of the body.
67．Which of the following is not true according to the passage?
A．women with high levels of vitamin D shows a sign of being biologically younger and healthier.
B．vitamin D has a protective effect on many ageing related diseases.
C．too much sunshine may increase our risk of skin cancer.
D．It has been proved that sunshine 'helps to keep you young'.

登录免费查看答案和解析

相关试题

E
In the atmosphere．carbon dioxide．acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping．
According to a weather expert’s prediction，the atmosphere will be 3°C warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate．If this warming up took place，the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities．
Also，the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere，possibly resulting in an alteration of the earth’s chief food growing zones．
In the past，concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet．But the weather experts are now paying more attention to West Antarctic，which may be affected by only a few degrees of warming，in other words，by a warming on the scale that will possibly take place in the next fifty  years from the burning of fuels．
Satellite pictures show that large areas of Antarctic ice are already disappearing．The evidence available suggests that a warming has taken place．This fits the theory that carbon dioxide warms the earth．
However, most of the fuel is burnt in the northern hemisphere，where temperatures seem to be falling．Scientists conclude，therefore，that up to now natural influences on the weather have gone beyond those caused by man．The question is：Which natural cause has most effect on the weather?
One possibility is the variable behavior of the sun．Astronomers at one research station have studied the hot spots and ‘cold’ spots (that is，the relatively less hot spots)on the sun．As the sun rotates，every 27．5 days，it presents hotter or colder faces to the earth，and different aspects to different parts of the earth．This seems to have a considerable effect on the distribution of the earth’s atmospheric pressure，and consequently on wind circulation．The sun is also changeable over a long term：its heat output goes up and down in cycles，the latest trend being downward．
Scientists are now finding shared relation between models of solar weather interaction and the actual climate over many thousands of years，including the last Ice Age．The problem is that
the models are predicting that the world should be entering a new Ice Age and it is not．One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(惰性)of the earth’s climate．If this is right，the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun’s fading heat．
72．It can be concluded that a concentration of carbon dioxide in the atmosphere would ______．
A．mean a warming-up in the Arctic
B．raise the temperature of the earth’s surface
C．prevent the sun’s rays from reaching the earth’s surface
D．explain the cause of great changes in the climate in the northern hemisphere
73．Although the fuel consumption is greater in the northern hemisphere, temperatures there
seem to be falling．This is _______．
A．mainly because the levels of carbon dioxide are rising
B．partly due to changes in the output of solar energy
C．possibly because the ice caps in the poles are melting
D．only due to the effect of the inertia of the earth’s climate
74．On the basis of their models , scientists are of the opinion that ________
A．the climate of the world should be becoming cooler
B．the new Ice Age will be delayed by the greenhouse effect
C．the man．made warming effect helps to increase the solar effects
D．it will take thousands of years for the inertia of the earth’s climate to take effect
75．If the assumption about the delay of a new Ice Age is correct , _________
A．ice would soon cover the northern hemisphere
B．the greenhouse effect could work in favor of the earth
C．the best way to overcome the cooling effect would be to bum more fuels
D．the increased levels of carbon dioxide could warm up the earth even more quickly

题型：未知
难度：未知

收藏答案/解析

D
A child who has once been pleased with a tale likes, as a rule, to have it retold in almost the same words, but this should not lead parents to treat printed fairy stories as formal texts. It is always much better to tell a story than read it out of a book, and, if a parent can produce what, in the actual situation of the time and the child, is an improvement on the printed text, so much the better.
A charge made against fairy tales is that they harm the child by frightening him or making him sad thinking. To prove the latter, one would have to show in a controlled experiment that children who have read fairy stories were more often sorry for cruelty than those who had not. As to fears, there are, I think, some cases of children being dangerously terrified by some fairy story. Often, however, this arises from the child having heard the story once. Familiarity with the story by repetition turns the pain of fear into the pleasure of a fear faced and mastered.
There are also people who object to fairy stories on the grounds that they are not objectively true, that giants, witches, two-headed dragons, magic carpets, etc. do not exist; and that, instead of being fond of the strange side in fairy tales, the child should be taught to learn the reality by studying history. I find such people, I must say so peculiar(奇怪的) that I do not know how to argue with them. If their case were sound, the world should be full of mad men attempting to fly from New York to Philadelphia on a stick or covering a telephone with kisses in the belief that it was their beloved girl-friend.
No fairy story ever declared to be a description of the real world and no clever child has ever believed that it was.
68. The author considers that a fairy story is more effective when it is _______.
A. repeated without any change              B. treated as a joke
C. made some changes by the parent            D. set in the present
69. The advantage claimed for repeating fairy stories to young children is that it _______.
A. makes them less fearful
B. develops their power of memory
C. makes them believe there is nothing to be afraid of
D. encourages them not to have strange beliefs
70. The author’s mention of sticks and telephones is meant to suggest that _______.
A. fairy stories are still being made up
B. there is some misunderstanding about fairy tales
C. people try to modernize old fairy stories
D. there is more concern for children's fears nowadays
71. One of the reasons why some people are not in favor of fairy tales is that _______.
A. they are full of imagination
B. they just make up the stories which are far from the truth
C. they are not interesting
D. they make teachers of history difficult to teach

题型：未知
难度：未知

收藏答案/解析

C
Everybody is happy as his pay rises. Yet pleasure at your own can disappear if you learn that a fellow worker has been given a bigger one. Indeed, if he is known as being lazy, you might even be quite cross. Such behavior is regarded as “all too human”, with the underlying belief that other animals would not be able to have this finely developed sense of sadness. But a study by Sarah Brosnan of Emory University in Atlanta, Georgia, which has just been published in Nature, suggests that it is all too monkey, as well.
The researchers studied the behaviors of some kind of female brown monkeys. They look smart. They are good-natured, co-operative creatures, and they share their food happily. Above all, like female human beings, they tend to pay much closer attention to the value of “goods and services” than males.
Such characteristics make them perfect subjects for Doctor Brosnan’s study. The researchers spent two years teaching their monkeys to exchange tokens (奖券) for food. Normally, the monkeys were happy enough to exchange pieces of rock for pieces of cucumber. However, when two monkeys were placed in separate and connected rooms, so that each other could observe what the other is getting in return for its rock, they became quite different.
In the world of monkeys，grapes are excellent goods (and much preferable to cucumbers). So when one monkey was handed a grape in exchange for her token, the second was not willing to hand hers over for a mere piece of cucumber. And if one received a grape without having to provide her token in exchange at all, the other either shook her own token at the researcher, or refused to accept the cucumber. Indeed, the mere presence of a grape in the other room (without an actual monkey to eat it) was enough to bring about dissatisfaction in a female monkey.
The researches suggest that these monkeys, like humans, are guided by social senses. In the wild, they are co-operative and group-living. Such co-operation is likely to be firm only when each animal feels it is not being cheated. Feelings of anger when unfairly treated, it seems, are not the nature of human beings alone. Refusing a smaller reward completely makes these feelings clear to other animals of the group. However, whether such a sense of fairness developed independently in monkeys and humans, or whether it comes from the common roots that they had 35 million years ago, is, as yet, an unanswered question.
64．According to the passage, which of the following statements is TRUE?
A．Only monkeys and humans can have the sense of fairness in the world.
B．Women will show more dissatisfaction than men when unfairly treated.
C．In the wild, monkeys are never unhappy to share their food with each other.
D．Monkeys can exchange cucumbers for grapes, for grapes are more attractive.
65．The underlined statement “it is all too monkey” means that ________.
A．monkeys are also angry with lazy fellows
B．feeling bitter at unfairness is also monkey’s nature
C．monkeys, like humans, tend to be envious of each other
D．no animals other than monkeys can develop such feelings
66．Which of the following conclusions is TRUE according to the passage?
A．Human beings' feelings of anger are developed from the monkeys.
B．In the research, male monkeys are less likely to exchange food with others.
C．Co-operation between monkeys stays firm before the realization of being cheated.
D．Only monkeys and humans have the sense of fairness dating back to 35 million years ago.
67．What can we infer about the monkeys in Sarah’s study?
A．The monkeys can be trained to develop social senses.
B．They usually show their feelings openly as humans do.
C．The monkeys may show their satisfaction with equal treatment.
D．Co-operation among the monkeys remains effective in the wild.

题型：未知
难度：未知

收藏答案/解析

B
　　Although man has known asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent. H. W. Johns, owner of a New York City Supply Shop for roofers, was responsible for he opening of that first mine.
　　Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the material and then showed its surprising powers to his customers. After putting on a pair of asbestos gloves, which looked much like ordinary work gloves, he took red-hot coals from the fireplace and played with them in his hands. How astonished the customers were to discover that he was not burned at all. You can well imagine that he had increasing business in asbestos roofing materials. However, because it was very expensive to transport them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home. This young man found great vein in the province of Quebec in Canada.
　　Ever since 1881 Quebec has led the world in the production of this unusual mineral, which is made up of magnesium, silicon, iron, and oxygen. When it is mined, the asbestos is heavy, just as you would expect a mineral to be. When it is separated, a strange thing happens; the rock breaks down into fine, soft, soapy fibers .
　　Scientists do not know why the rock can be separated easily into threads,but they have found thousands of uses of this fireproof material, of the so-called “cloth of stone”.
　60. Which title best expresses the main idea of this passage?
　   A. Asbestos mined in Canada                  B. Fireproof matter
C. A “wonder” mineral                           D. A new roofing material
　61. Johns proved his ability as a salesman by_______.
　   A. going into roofing business
B. carrying asbestos from Italy
　   C. sending a trained scientist
D. showing the use of asbestos gloves
　62. Which is the most important character of asbestos that the author wants to show us?
　   A. It is like thread.                               B. It feels soapy.
C. It burns easily.                                 D. It is unusually heavy.
　63. The author’s main purpose in writing this passage was to _______.
　   A. show the need for more scientists
　   B. compare asbestos with other minerals
　   C. increase the sales of asbestos
　   D. present facts about asbestos

题型：未知
难度：未知

收藏答案/解析

第三节、阅读理解（共20小题；每小题2分，满分40分）
阅读下列短文，从每题所给的四个选项（A，B，C，D）中，选出最佳选项，并在答题卡上将该项目涂黒。
A
Hillary ,Clinton, 59, with her famous “I’m in, and I’m in to win.” 2008 Race, began her e-mail to supporters, saying “I want you to join me not for the campaign but for a conversation about the future of our country. Let’s talk．1et’s chat．”
Mrs．Clinton said that she would focus on “practical changes” in foreign, domestic, and national security policy, such as finding “a right end”to the Iraq war , expanding health insurance, pursuing greater energy independence and strengthening Social Security and Medicare, which satisfies many American people．
In her statement, Mrs Clinton also frankly talked about an issue that worries her a lot. Whether she can , in fact, win the presidency, some voters sti1l associate her most with the Clinton government.
“I have never been afraid to stand up for my beliefs,”Mrs.Clinton said on the Website．“After nearly $70 million spent against my campaigns in New York and two wins, I can say I know how Republicans think, how they operate, and how to beat them.”
If successful, she would be the first female nominee(被提名者)of a major American political party, and the first wife of a former president to seek a return to the White House．President Bill CIinton left office in 2000 after two terms rnarked by economical expansion and a series of official examinations of his personal life and the CIintons’ busincss dealings．But the successes and shadows of those years will likely affect Mrs．Clinton．who was once an important adviser and caused some disagreements in his government．
Yet Mrs Clinton has become a major political figure in America．
56. By saying “I’m in to win.” Hillary probably means that ______.
A. she is online to get people’s support to run for presidency
B. she is going to run for election and work hard to win
C. she is online to get more support and she is sure she is to win
D. She has decided to run for president and work hard to win
57. It can be inferred from the passage that _______.
A. Clinton left office only because of his personal life
B. Hillary was once deeply involved in her husband’ government
C. all her voters strongly support her and believe in her
D. the whole election campaign costs Hillary nearly $70 million
58. What many American people are deeply concerned about is _______
A. how to solve the energy problem
B. when and how to find a proper solution to the Iraq war
C. what practical things Hillary will do for them
D. how to strengthen Social Security and Medicare
59. The author’s attitude toward Hillary is ________
A. critical B. positive C. negative D. objective

题型：未知
难度：未知

收藏答案/解析

推荐套卷

热门套卷