Since the gene, called DAF-16 in worms, was found in many animals and in humans, the finding could open up new ways to affect aging, immunity(免疫)and resistance in humans, the scientists said.
“We wanted to find out how normal aging is being governed by genes and what effect these genes have on other traits, such as immunity,” said Robin May of the University of Birmingham, who led the study.
Populations across the world are aging at a surprising pace, bringing potentially big challenges for health and social care systems. A study by Danish scientists last year found that half of babies born in the rich world today will live to celebrate their 100th birthdays. Scientists are eager to find out how people age to try to develop drugs to help them stay healthier as their lives extend.
“What we have found is that things like resistance and aging tend to go hand in hand,” May said in an interview.
May’s team compared longevity, stress resistance and immunity in four related species of worm. They also looked for differences in the activity of DAF-16 in each of the four species, and found that they were all quite distinct.
May said DAF-16 was active in most cells in the body and was very similar to a group of human genes called FOXO genes, which scientists believe play a role in the aging process.
“The fact that subtle（微妙的）differences in DAF-16 between species seem to have such an impact on aging and health is very interesting and may explain how differences in lifespan and related traits have arisen during evolution,” May said.
67. In which section may the text appear in a newspaper?
A. Education. B. Science. C. Entertainment. D. Culture.
68. What can we know from the third paragraph?
A. New ways have been found to affect aging. B. Babies in the rich world will all live longer.
C. Present social care systems are poorly managed. D. Aging populations are causing more challenges.
69. From the text we know that DAF-16_____.
A. is a gene that is only found in worms B. can make people live longer
C. has an effect on aging and immunity D. has been quite familiar to scientists
70. What can be the best title of the passage?
A. Scientists Find Gene Linked to Aging B. Population Aging Faster than Expected
C. How to Make People Live Longer D. Gene Determines How Long We Live
Perhaps the most famous theory, the study of body movement, was suggested by Professor Ray Birdwhistell. He believes that physical appearance is often culturally programmed. In other words, we learn our looks—we are not born with them. A baby has generally informed face features. A baby, according to Birdwhistell, learns where to set the eyebrows by looking at those around-family and friends. This helps explain why the people of some areas of the United States look so much alike, new Englanders or Southerners have certain common face features that cannot be explained by genetics (遗传学). The exact shape of the mouth is not set at birth, it is learned after. In fact, the final mouth shape is not formed until well after new teeth are set. For many, this can be well into grown-ups. A husband and wife together for a long time often come to look alike. We learn our looks from those around us. This is perhaps why in a single country area where people smile more than those in other areas. In the United States, for example, the South is the part of the country where the people smile most frequently. In New England they smile less, and in the western part of New York State still less. Many southerners find cities such as New York cold and unfriendly, partly because people on Madison Avenue smile less than people on Peachtree Street in Atlanta, Georgia. People in largely populated areas also smile and greet each other in public less than people in small towns do. Ray Birdwhistell believes that physical appearance ___________.
| A．has little to do with culture |
| B．has much to do with culture |
| C．is ever changing |
| D．is different from place to place |
According to the passage, the final mouth shape is formed _____________.
| A．before birth |
| B．as soon as one’s teeth are newly set |
| C．sometime after new teeth are set |
| D．around 15 years old |
Ray Birdwhistell can tell what area of the United States a person is from by __________.
| A．how much he or she laughs |
| B．how he or she raises his or her eyebrows |
| C．what he or she likes best |
| D．the way he or she talks |
This passage might have been taken out of a book dealing with ____________.
| A．physics | B．chemistry |
| C．biology | D．none of the above |
Jonathan James looks like just another kid about to graduate from high school. But this 19-year-old Swede is anything but ordinary, from the computer in his parents’ home he helps the US Federal Bureau of Investigation (FBI) find out the world’s most wanted cyber criminals (网络犯罪分子).
Jonathan first made headlines when he and another Swede, Fredrik Bjoerck, found out the maker of the “Melissa” virus (病毒) in March 1999. He came to the aid of the FBI again on May 7, finding out the suspected (嫌疑的) sender of the dangerous “I LOVE YOU” virus. The suspect was caught in Manila on May 8.
Jonathan’s special skills are in hot demand as officials around the world express alarm at the “virtual” crimewave. In between studying for final exams, hanging out with friends and refereeing his younger brother’s football matches, the quiet, gentle teenager also gives lessons on e-security (电子安全) to large companies. He reads a lot and exchanges information with other computer experts to know much about the latest tricks of the hacker (黑客) trade.
Many companies have already tried to employ him, but he is not interested at the moment. Instead, he plans to begin law school in the autumn at Sweden’s Uppsala University and start up his own e-security company.
Although he works with the FBI now, his family insists he’s just “a regular kid”. “Jonathan is a great kid, he has his friends and he does a lot more than just play with the computer,” his little sister Tessa said, adding that he helps the FBI because “he likes to help”, not because he’s looking for fame and recognition.
When the world was hit by the “Love Bug” virus, Jonathan was too busy preparing a speech on e-security to look into the problem. “Finally on May 7, I had some free time, so I began looking.” Within a few hours, he had found the suspect and e-mailed his method and results to the FBI. He said his work on the “Melissa” virus, which took three weeks to solve, was a big help in finding the suspect so quickly.
“This time I knew exactly where to start, I knew what to disregard and what to look at.” The passage mainly wants to tell us that ___________.
| A．Swedish kid helps FBI find out the most wanted cyber criminals |
| B．Jonathan is really a quiet, gentle and ordinary boy |
| C．many companies want the young computer expert to join in |
| D．any cyber criminals will surely be found out wherever they are |
The public started to know something about Jonathan just from _________.
| A．his helping the US FBI to find out the sender of the dangerous “I LOVE YOU” virus |
| B．his work together with Fredrik Bjoerck to find out the maker of the “Melissa” virus |
| C．his little sister’s talk about his good qualities as a regular kid and a good programmer |
| D．his speech on e-security to many computer companies after his fight against hackers |
From Jonathan’s success in finding out the sender of the dangerous ‘Love Bug” virus we can infer that _________.
| A．where there’s a will, there’s a way |
| B．experience is knowledge |
| C．hard work leads to success |
| D．failure is the mother of success |
What do we know about Jonathan?
| A．He is a good fame hunter with various abilities. |
| B．He is such a brave fighter that any criminal will feel afraid. |
| C．He is an expert on security, not interested in running a company. |
| D．He is a regular kid but does something unusual. |
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.
The first is called the “tank test”. A modern airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构) of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.
The most dangerous test happens when the new plane is going through test flights in the air. The test pilot must find out exactly what happens when the engines (发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.By doing the “tank test”, the engineers can find out ___________.
| A．the pressure inside and outside the plane |
| B．the strength of the plane structure |
| C．the amount of air in the plane |
| D．the power of the airplane engines |
What will happen to the plane under the “tank test”?
| A．It will be broken. |
| B．It will be made stronger. |
| C．It will be filled with water. |
| D．It will be tested by pilots. |
According to the text, why are test flights most dangerous?
| A．The engines may be damaged. |
| B．The pilot may lose control of the plane. |
| C．The plane may explode in the air. |
| D．Too much air may get into the plane. |
What might be the most suitable title for the text?
| A．Two Important Tests on Airplanes |
| B．The Danger of Testing Airplanes |
| C．The Importance of Flying Safely |
| D．How Airplanes Are Made and Tested |
Cara Lang is 13. She lives in Boston, Massachusetts, in the US. Last Thursday, she didn’t go to school. She went to work with her father instead. Every year, on the fourth Thursday in April, millions of young girls go to work. This is Take Our Daughters to Work Day. The girls are between the ages of 9 to 15. They spend the day at work with an adult, usually a mother, aunt, or uncle. They go to offices, police stations, laboratories, and other places where their parents or other family members work. Next year, the day will include sons, too.
The Ms. Foundation, an organization for women, started the program about ten years ago. In the US, many women work outside the home. The Ms. Foundation wanted girls to find out about many different kinds of jobs. Then, when the girls grow up, they can choose a job they like.
Cara’s father is a film director. Cara says, “It was very exciting for me to go to the studio with my dad. I saw a lot of people doing different jobs.” Many businesses have special activities for girls on this day. Last year, Cara went to work with her aunt at the University of Massachusetts. In the engineering department, the girls learned to build a bridge with toothpicks and candy. In the chemistry department, they learned to use scales. They learned about many other kinds of jobs, too.
Right now, Cara does not know what jobs she will have when she grows up. But because of Take Our Daughters to Work Day, she knows she has many choices. What is Cara’s father?
| A．An engineer. | B．An official. |
| C．A moviemaker. | D．A professor. |
According to the passage, Take Our Daughters to Work Day is __________.
| A．on every Thursday in April |
| B．a holiday for girls of all ages |
| C．a day for girls to know about jobs |
| D．a day for girls to get a job easily |
On this special day, Cara has done all the following EXCEPT that __________.
| A．she learned to use scales |
| B．she worked as an actress |
| C．she went to work with her aunt |
| D．she used toothpicks and candy to build a bridge |
What is probably the best title for the passage?
| A．Cara Lang, a Fortunate Girl |
| B．Take Our Daughters to Work Day |
| C．Children’s Day and Work Day |
| D．Ms. Foundation, an Organization for Women |
The old idea that child prodigies (神童) “burn themselves” or “overtax their brains” in the early years, therefore, suffer from failure and (at worst) mental illness is just a myth. As a matter of fact, the outstanding thing that happens to bright children is that they are very likely to grow into bright adults.
To find this out, 1,500 gifted persons were followed up to their thirty-fifth years with these results:
On adult intelligence tests, they scored as high as they did as children. They were, as a group, in good health, physically and mentally. Eighty-four percent of their group were married and seemed content with their life.
About 70 percent had graduated from colleges, though only 30 percent had graduated with honors. A few had even flunked out (退学), but nearly half of these had returned to graduate.
Of the men, 80 percent were in one of the professions or in business, managerial or semiprofessional jobs. The women who had remained single had offices, business, or professional occupations.
The group had published 90 books and 1,500 articles in scientific, scholarly, and literary magazines and had collected more than 100 patents.
In a material way they didn’t do badly either. Average income was considerably higher among the gifted people, especially the men, than for the country as a whole, despite their comparative youth when last surveyed.
In fact, far from being strange, maladjusted (难以适应) people locked in an ivory tower, most of the gifted were turning their early promises into practical reality.The main idea of the passage is __________.
| A．that gifted adults can be as intelligent as when they were young |
| B．that bright children are unlikely to be physically and mentally healthy |
| C．that gifted children are most likely to become bright grown-ups |
| D．that when the bright children grow up, they become ordinary |
From the passage, we can conclude that ____________.
| A．most of the gifted children became white-collar workers |
| B．half of the gifted followed up graduated from colleges |
| C．each of the talented published at least one article |
| D．successful men got higher income than successful women |
Which of the following is mentioned in the passage?
| A．The gifted could not be fit for their social positions. |
| B．Most of the bright and successful women remained single. |
| C．The gifted men got full marks on intelligence tests. |
| D．Most of the gifted appeared satisfied with their life. |
The explanation of the underlined part “turning their early promises into practical reality” is _____________.
| A．earning their living and keeping promises |
| B．doing practical jobs and facing reality |
| C．doing what they have promised |
| D．realizing what they were expected |
粤公网安备 44130202000953号