Babies born in summer are more likely to become short-sighted in late life, a study has shown.
As many as a quarter of all cases of short-sightedness are caused by too great an exposure to sunlight in the first weeks of life, say eye experts.
They are advising all parents to put sunglasses on their babies during the first weeks.
Scientists had already established that over-exposure to sunlight caused shortsightedness in animals.
Researchers who compared the months in which babies were born with whether they needed glasses later on say the principle also applies to humans.
A study of almost 300,000 young adults-the largest of its kind-showed that those born in June and July had a 25 per cent greater chance of becoming severely short-sighted than those born in December or January.
Research leader Professor Michael Belkin, of Tel Aviv University, said it was because prolonged illumination(光照) causes the eyeball to lengthen-causing short-sightedness.
Hence the more light a newborn is exposed to, the more the eyeball lengthens and the worse the short-sightedness will be.
The mechanism which lengthens the eyeball is associated with levels of melatonin(褪黑激素), a pigment (色素) which protects the skin against harmful rays of the sun.
In young babies not enough melatonin is released as protection, meaning they are more vulnerable to sunburn and changes to eyeball shape.
Sight expert Professor Daniel O’Leary, of Anglia Ruskin University in Cambridge, said “At the moment we don’t know the precise cause of why light exposure affects sight, but the evidence seems to prove that it is one of the reasons for people becoming shortsighted.”Melatonin is a kind of material to ___________.
| A．prevent the eyes from becoming near-sighted |
| B．protect the skin from harmful sun rays |
| C．make our body strong |
| D．protect babies’ eyes from summer sun |
From what Professor Daniel O’Leary says we can conclude that ___________.
| A．there is no evidence that shortsightedness is related to exposure to sunlight |
| B．whether light exposure affects sight still needs to be further proved |
| C．he believes that light exposure can cause shortsightedness |
| D．he tries to give the cause of why light exposure affects sight |
The Basics of Math—Made Clear
Basic Math introduces students to the basic concepts of mathematics, as well as the fundamentals of more tricky areas. These 30 fantastic lectures are designed to provide students with an understanding of arithmetic(算数) and to prepare them for Algebra (代数) and beyond.
The lessons in Basic Math cover every basic aspect of arithmetic. They also look into exponents (指数), the order of operations, and square roots. In addition to learning how to perform various mathematical operations, students discover why these operations work, how a particular mathematical topic relates to other branches of mathematics, and how these operations can be used practically.
Basic Math starts from the relatively easier concepts and gradually moves on to the more troublesome ones, so as to allow for steady and sure understanding of the material by students. The lectures offer students the chance to “make sense” of mathematical knowledge that may have seemed so frightening. They also help students prepare for college mathematics and overcome their anxiety about this amazing — and completely understandable — field of study.
By the conclusion of the course, students will have improved their understanding of basic math. 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. In addition, 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 ways that make them seem clear and obvious. From the basic concrete ideas to the more abstract problems, he is a master in making math lectures learner-friendlier and less scary.
With a PhD in Mathematics Education from Georgia State University, Dr. Siegel teaches mathematics at Central Arizona College. His courses include various make-up classes and a number of lectures for future primary school teachers.
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.What does the course Basic Math mainly cover?
| A．Arithmetic. | B．College Mathematics. |
| C．Algebra. | D．Mathematics Education. |
What benefits can students expect from Basic Math?
| A．Stronger imaginative ability. |
| B．Additional presentation skills. |
| C．Greater chances of becoming teachers. |
| D．More mathematical confidence. |
What can we learn about Professor H. Siegel?
| A．He is a guest lecturer at Kentucky Educational Television. |
| B．He works in Georgia State University. |
| C．He is to deliver 30 lectures in Basic Math. |
| D．He specializes in training teachers. |
Where is the passage most likely to have been taken from?
| A．A news report. | B．An advertisement |
| C．A lesson plan. | D．A book review |
You’ve just come home, after living abroad for a few years. Since you’ve been away, has this country changed for the better or for the worse?
If you’ve just arrived back in the UK after a fortnight’s holiday, small changes have probably surprised you—anything from a local greengrocer suddenly being replaced by a mobile-phone shop to someone in your street moving house.
So how have things changed to people coming back to Britain after seven, ten or even 15 years living abroad? What changes in society can they see that the rest of us have hardly noticed—or now take for granted? To find out, we asked some people who recently returned.
Debi: When we left, Cheltenham, my home town, was a town of white, middle-class families—all very conservative (保守的).The town is now home to many eastern Europeans and lots of Australians, who come here mainly to work in hotels and tourism. There are even several shops only for foreigners.
Having been an immigrant (移民) myself, I admire people who go overseas to find a job. Maybe if I lived in an inner city where unemployment was high, I’d think differently, but I believe foreign settlers have improved this country because they’re more open-minded and often work harder than the natives.
Christine: As we flew home over Britain, both of us remarked how green everything looked. But the differences between the place we’d left behind and the one we returned to were brought sharply into focus as soon as we landed.
To see policemen with guns in the airport for the first time was frightening — in Cyprus, they’re very relaxed — and I got pulled over by customs officers just for taking a woolen sweater with some metal-made buttons out of my case in the arrivals hall. Everyone seemed to be on guard. Even the airport car-hire firm wanted a credit card rather than cash because they said their vehicles had been used by bank robbers. But anyway, this is still a green, beautiful country. I just wish more people would appreciate what they’ve got.After a short overseas holiday, people tend to ______ .
| A．expect small changes | B．notice small changes |
| C．welcome small changes | D．exaggerate (夸大) small changes |
How does Debi look at the foreign settlers?
| A．Cautiously. | B．Skeptically. |
| C．Positively. | D．Critically. |
When arriving at the airport in Britain, Christine was shocked by ______ .
| A．the tight security | B．the messy arrivals hall |
| C．the relaxed policemen | D．the bank robbers |
Which might be the best title for the passage?
| A．Life in Britain. | B．Britain in Memory. |
| C．Britain in Future. | D．Back in Britain. |
When something goes wrong, it can be very satisfying to say, “Well, it’s so-and-so’s fault.” or “I know I’m late，but it’s not my fault; the car broke down.” It is probably not your fault, but once you form the habit of blaming somebody or something else for a bad situation, you are a loser. You have no power and could do nothing that helps change the situation. However, you can have great power over what happens to you if you stop focusing on whom to blame and start focusing on how to remedy the situation. This is the winner’s key to success.
Winners are great at overcoming problems. For example, if you were late because your car broke down, maybe you need to have your car examined more regularly. Or, you might start to carry along with you the useful phone numbers, so you could call for help when in need. For another example, if your colleague causes you problems on the job for lack of responsibility or ability, find ways of dealing with his irresponsibility or inability rather than simply blame the person. Ask to work with a different person, or don’t rely on this person. You should accept that the person is not reliable and find creative ways to work successfully regardless of how your colleague fails to do his job well.
This is what being a winner is all about—creatively using your skills and talents so that you are successful no matter what happens. Winners don’t have fewer problems in their lives; they have just as many difficult situations to face as anybody else. They are just better at seeing those problems as challenges and opportunities to develop their own talents. So, stop focusing on “whose fault it is.” Once you are confident about your power over bad situations, problems are just stepping stones for success.According to the passage, winners .
| A．blame themselves rather than others |
| B．meet with fewer difficulties in their lives |
| C．have responsible and able colleagues |
| D．deal with problems rather than blame others |
The underlined word remedy in Paragraph 1 is closest in meaning to ______.
| A．improve | B．accept |
| C．avoid | D．consider |
When problems occur, winners take them as ______.
| A．excuses for their failures | B．chances for self-development |
| C．challenges to their colleagues | D．barriers to greater power |
Which of the following is the best title for the passage?
| A．A Winner’s Opportunity. | B．A Winner’s Problem. |
| C．A Winner’s Secret. | D．A Winner’s Achievement. |
Finding true happiness is a universal aspiration (渴望). We all want it, but can we all have it? Genuine happiness is written all over our faces when we are truly contented, and, likewise, a forced smile does nothing to hide underlying sadness.
Believing that everyone can create their own lasting joy, Matthieu Richard has been declared the Happiest Man in the World. Richard earned his “happiest man” status after a series of laboratory tests in 2004. Richard has shared his thoughts on happiness with a worldwide audience. As an experienced speaker, he has explained his insights into happiness to everyone, from students to corporate groups. Looking inwards to find joy rather than relying on outer conditions, he believes, is the way to achieve well-being.
“It’s quite clear that the outer conditions are not enough. The way we interpret those outer conditions in our inner experience is what determines either a sense of well-being or misery. We love to go jogging for fitness and we do all kinds of things to remain beautiful, yet we spend surprisingly little time taking care of what matters most: the way our minds function. It’s the essential thing that determines the quality of our experience.” Besides this, Richard stresses that it is not what’s happening around us that makes us unhappy, but rather the way we choose to react to it.
The pursuit of happiness is becoming a modern obsession（痴迷）. As life becomes more complex, our ability to process our reactions to various outside influences comes under strain. “Genuine happiness” he says, “doesn’t mean pleasant feelings one after the other. It’s more like a series of qualities that we can develop as skills — like openness, genuine love, compassion, inner strength and inner peace.”Richard has been declared the Happiest Man in the World _______.
| A．because he has shared his thoughts on happiness with a worldwide audience |
| B．after he has explained his insights into happiness to everyone |
| C．after a series of laboratory tests |
| D．because he tries his best to achieve happiness and well-being |
According to Richard, what is the best way to achieve well-being?
| A．Interpreting those outer conditions in our inner experience. |
| B．Looking inwards to find joy rather than relying on outer conditions. |
| C．Spending little time taking care of what matters most. |
| D．Reacting to various outside influences in the modern world. |
What determines the quality of our experience?
| A．The way our minds react to outer conditions. |
| B．Insights into happiness that we hold. |
| C．The constant pursuit of happiness in our life. |
| D．Those outer conditions affecting our happiness. |
How can we pursuit happiness?
| A．Go jogging for happiness. |
| B．Do everything to remain beautiful. |
| C．Make sure that our minds are functioning normally. |
| D．Develop necessary qualities. |
If you see a group of people dancing and singing on the street or in the railway station, you don't need to feel surprised．They are a flash mob （快闪族）, which is a group of people who come together suddenly in a public place, do something unusual for a brief period of time, and then quickly break up．They are usually organized with the help of the Internet or other digital communication network．At a predetermined time, they gather and perform some distractions（消遣） such as waving their hands and exchanging books, Then, they quickly break up before the police can arrive．Using mobile phones, the flash mob can change its location if the first one has been replaced for any reason．
Bill Lasik, senior editor of Harper’s Magazine, organized the first flash mob in Manhattan in May 2003 and the first successful flash mob came together on June 3, 2003 - after the first attempt was foiled at Macy's department store．Lasik claimed that the activity was designed to make fun of hipsters （起时髦的人）, and call attention to the cultural atmosphere．
Flash mob gatherings can sometimes shock people．Such an activity might seem amusing and untrue, but it also might frighten people who are not aware of what is taking place．Undoubtedly, flash mobs can serve as good political tools in any direction．They also have great economic potential, such as using flash mobs to advertise a product．
The flash mob is now becoming more and more popular．People use it to do many things．For example, in 2009, Michael Jackson's fans took part in a flash mob to remember him．Hundreds of his fans gathered singing and dancing Michael's famous song "Beat It" together．Flash mobs give people from all walks of life an opportunity to come together to create a memory．The undefined word "foiled" in Paragraph 2 can be replaced by _。
| A．forgotten | B．prevented |
| C．announced | D．confirmed |
What can you learn about the flash mob from the passage?
| A．The flash mob usually breaks up quickly for lacking enough time． |
| B．Once the place for the activity is determined, it can't be changed． |
| C．The flash mob can be made use offing many fields just for fun． |
| D．It gives people the chance to come together to do something unusual． |
The main purpose of the passage is
| A．to entertain | B．to encourage |
| C．to inform | D．to persuade |
The writer's attitude towards the flash mob is
| A．negative | B．objective |
| C．favorable | D．doubtful |