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If you want to stay young, .sit down and have a good think. This is the research finding of a team of Japanese doctors, who said that most of our brains are not getting enough 1 ; and as a result, we are growing old unnecessarily 2 .
Professor Matsuzsawa wanted to fund out why quite 3 farmers in northern Japan appeared to be losing their ability to 4 and reason (推理) at a rather early age, and how the speed of getting old could be 5 down.
With a team of researchers at Tokyo National University, he set about 6 brain volumes (容量) of a thousand people of different ages with different jobs.
Computer technology helped the researchers to get most 7 measures of the volume of the front and side parts of the brain, which 8 something to do with intellect (智力) and feelings, and 9 the human characters. As we all know, the back part of the brain, which 10 tasks like eating and breathing, does not contract (萎缩)with ages.
Contraction of front and side parts was 11 in some people in their thirties, 12 it wag still not found in some sixty
yearold.
Matsuzawa concluded from his tests that there is a simple way to 13 the contraction 14 the head.
The findings show that contraction of the brain begins 15 in people in the 16 than in the towns, Those with 17 possibility are lawyers, 18 by university professors and doctors. 19 workers doing the same work 20 in government offices are as likely to have contracting brains as the farm workers.
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Rome-Doctors and medical groups around the world last weekend reacted with strong opposition to the news that an Italian specialist is on the point of cloning the first human baby．
Dr．Severino Antinori, who is the head of a hospital in Rome, has been referred to in an Arab newspaper as claiming that one of his patients is eight weeks pregnant （怀孕的）with a cloned baby．
Antinori refused to comment on the reports, but in March 2001 he said he hoped to produce a cloned embryo （卵）for implantation within two years．So far seven different kinds of mammals have already successfully cloned, including sheep, cats and most recently rabbits．
Doctors showed their doubt and were strongly opposed although they admit that human cloning would finally come true unless there was a world wide ban on the practice．
Professor Rudolf Jaenisch of the Whitehead Institute for Biomedical Research at the Massachusetts Institute of Technology said: “I find it astonishing that people do this where the result can be foretold that it will not be a normal baby．It is using humans as guinea pigs．It makes people feel sick．” But Ronald Green, director of the Ethics institute at Darmouth College in the US, said it is unlikely that an eight-week-old pregnancy would lead to a birth．
So far all cloned animals have suffered from some different serious disorders, many of them dying soon after their births ．
Doctors are opposed to human cloning because they are worried about the welfare of the cloned child if there is one．
“There are no benefits of cloned human beings, just harm,”said Dr．Michael Wilks of the UK．
45．What is the doctors’ general attitude to cloning of humans according to the passage?
A．They are against it． B．They support it．
C．They welcome it． D．They pay no attention to it．
46．Which of the following statements is true according to the passage?
A．Doctor Severino Antinori is strongly opposed to cloning human beings．
B．Up to now, seven kinds of animals have been cloned, including sheep, cats, humans and rabbits．
C．Professor Rudolf Jaenisch is carrying on an experiment on cloning an eight-week-old embryo．
D．Ronald Green doubts about the future successful birth of the so-called cloned embryo．
47．Which is the best title for the passage?
A．The Success of Cloning Humans B．The Anger at Cloning Humans
C．Failure of Cloning Humans D．First Cloned Human?
Basic Math introduces students to the basic things of mathematics, as well as some easy methods of learning it. These 30 fantastic courses are designed to provide students with understanding of arithmetic and to prepare them for Algebra (代数) and beyond.
The lessons in Basic Math cover every basic field of arithmetic. They also look into exponents (指数), the order of operations, and square roots. In addition to that, students also discover how a particular mathematical topic relates to other branches , and how they can be used practically.
Basic Math starts from easier concepts and gradually moves on to the more troublesome ones. The lectures offer students the chance to understand of mathematical knowledge that may have seemed so frightening. They also help students prepare for college mathematics and develop confidence in this amazing field of study.
With the help of these lectures, they will be able to clear away the mystery (神秘性) of mathematics and face their studies with more confidence than they ever imagined. Besides, they will strengthen their ability to accept new and exciting mathematical challenges.
Professor H. Siegel, honored by Kentucky Educational Television as "the best math teacher in America, " is a devoted teacher and has a gift for explaining mathematical concepts in clear and interesting ways. From the basic ideas to the more difficult problems, he is a master in making math lectures learner-friendlier and less frightening
With a PhD in Mathematics Education form Georgia State University, Dr. Siegel now teaches mathematics at Central Arizona College.
If the course fails to provide complete satisfaction to you, you can easily exchange it for any other course that we offer. Or you can get your money back.
1.What does the course Basic Math mainly cover?
|
A．Algebra |
B．College Mathematics |
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C．Arithmetic |
D．Mathematics Education |
2. What good things can students expect from Basic Math?
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A．Stronger imagination ability. |
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B．Additional presentation skills. |
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C．More mathematical confidence. |
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D．Greater chances of becoming teachers. |
3.What can we learn about Professor H. Siegel?
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A．He is a lecturer at Kentucky Educational Television. |
|
B．He is delivering 30 lectures in Basic Math. |
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C．He works in Georgia State University. |
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D．He specializes in training teachers. |
4.Where is the passage most likely to have been taken from?
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A．news report |
B．A book review |
|
C．A lesson plan |
D．An advertisement |
The 2012 London Olympics had enough problems to worry about. But one more has just been added -- a communications blackout caused by solar storms.
After a period of calm within the Sun, scientists have detected the signs of a flesh cycle of sunspots that could peak in 2012, just in time for the arrival of the Olympic torch in London.
Now scientists believe that this peak could result in vast solar explosions that could throw billions of tons of charged matter towards the Earth, causing strong solar storms that could jam the telecommunications satellites and interact links sending five Olympic broadcast from London.
"The Sun's activity has a strong influence on the Earth. The Olympics could be in the middle of the next solar maximum which could affect the functions of communications satellites," said Professor Richard Harrison, head of space physics at the Rutherford Appleton Laboratory in Oxfordshire.
At the peak of the cycle, violent outbursts called coronal mass ejections (日冕物质抛射) occur in the Sun's atmosphere, throwing out great quantities of electrically-charged matter. "A coronal mass ejection can carry a billion tons of solar material into space at over a million kilometres per hour. Such events can expose astronauts to a deadly amount, can disable satellites, cause power failures on Earth and disturb communications," Professor Harrison added. The risk is the greatest during a solar maximum when there is the greatest number of sunspots.
Next week in America, NASA is scheduled to launch a satellite for monitoring solar activity called the Solar Dynamics Observatory (SDO), which will take images of the Sun that are 10 times clearer than the most advanced televisions available.
The Rutherford Appleton Laboratory helped to make the high-tech cameras that will capture images of the solar flares (太阳耀斑) and explosions as they occur.
Professor Richard Harrison, the lab's director, said that the SDO should be able to provide early warning of a solar flare or explosion big enough to affect satellite communications on Earth "If we have advanced warning, we'll be able to reduce the damage. What you don't want is things switching off for a week with no idea of what's caused the problem," he said.
【小题1】The phrase "communications blackout" in paragraph 1 most probably refers to____________ during the 2012 Olympics.
| A．the extinguishing of the Olympic torch |
| B．the collapse of broadcasting systems |
| C．the transportation breakdown in London |
| D．the destruction of weather satellites |
| A．the sun’s activities have little to do with the earth |
| B．the London Olympic broadcasting will be possibly influenced by the 2012 peak of sunspots |
| C．the 2012 Olympic Games are during the solar maximum of throwing out greatest number of sunspots |
| D．solar explosion will cause strong storms on the earth |
| A．The most fatal matter from the corona falls onto Earth. |
| B．The solar storm peak occurs in the middle of each cycle. |
| C．It takes several seconds for the charged matter to reach Earth. |
| D．The number of sunspots declines after coronal mass ejections. |
| A．take images of the solar system |
| B．provide early warning of thunderstorms |
| C．keep track of solar activities |
| D．improve the communications on Earth |
| A．Solar Storms: An Invisible Killer |
| B．Solar Storms: Earth Environment in Danger |
| C．Solar Storms: Threatening the Human Race |
| D．Solar Storms: Human Activities to Be Troubled |
If you want to improve your child’s results at school, you could do a lot worse than ensuring that they do plenty of exercise. Scientists have already shown that physical activity can make you brainier. But a team in America has used scans to show that an important part of the brain actually grows in children who are fit. These youngsters tend to be more intelligent and have better memories than those who are inactive.
Scientists also found that one of the most important parts of their brains was 12 percent larger than those of unfit children. They believe that encouraging children to take exercise from a very young age could help them do better at school later. Researchers from the University of Illinois, in the U.S., studied the brains of 49 children aged nine and ten using a magnetic resonance imaging scan (核磁共振摄影扫描), a technique which provides very detailed pictures of organs and tissues in the body.
They also tested the fitness levels of the children by making them run on a treadmill (跑步机). The scientists found that the hippocampus, a part of the brain responsible for memory and learning, was around 12 percent larger in the fitter children.
Professor Art Kramer, who led the study published in the journal Brain Research, said the findings had important implications for encouraging individuals to take part in sport from a young age. “We knew that experience and environmental factors and socioeconomic status all impact brain development,” he said. “If you get some terrible genes from your parents, you can’t really fix that, and it’s not easy to do something about your economic status. But here’s something that we can do something about.”
【小题1】 If you want to improve your children’s result in school, ____________.
| A．it is worse to ensure that they do plenty of exercise |
| B．you can have their brain scanned |
| C．it could be better to make sure that they do a lot of exercise |
| D．you can do a lot except ensuring that they do exercise |
| A．The fitness level of the children is linked to their intelligence. |
| B．Children who have a larger hippocampus will probably have better memories. |
| C．You can do something about the genes from your parents. |
| D．Unhealthy children will probably have a smaller hippocampus than others. |
| A．genetic factor | B．economic status | C．physical fitness | D．economic development |
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