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 short-sightedness 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 short-sighted.”
55. Babies born in summer are more likely to be short-sighted ____________.
A. because the summer sun is too strong for babies
B. because babies born in summer have lengthened eyeballs
C. if they are exposed to much sunlight in the first weeks after they are born
D. if parents don’t know a proper way to protect their babies’ eyes
56. 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
57. From what Professor Daniel O’Leary says we can conclude that ___________.
A. there is no evidence that short-sightedness 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 short-sightedness
D. he tries to give the cause of why light exposure affects sight
58. The underlined word “vulnerable” in the passage probably means __________.
A. easy to be harmed B. resistant
C. protective D. changeable
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| C．are full of adventure stories |
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In early autumn I applied for admission to college. I wanted to go nowhere but to Cornell University, but my mother fought strongly against it. When she saw me studying a photograph of my father on the sports ground of Cornell, she tore it up.
“You can’t say it’s not a great university, just because Papa went there.”
“That’s not it at all. And it is a top university.” She was still holding the pieces in her hand. “But we can’t afford to send you to college.”
“I wouldn’t dream of asking you for money. Do you want m e to get a job to help support you and Papa? Things aren’t that bad, are they?”
“No,” she said. “I don’t expect you to help support us.”
Father borrowed money form his rich cousins to start a small jewellery shop, His chief customers were his old college friends. To get new customers, my mother had to help. She picked up a long-forgotten membership in the local league of women, so that she could get to know more people. Whether those people would turn into customers was another question. I knew that my Parents had to wait for quite a long time before their small investment (投资) could show returns. What’s more ,they had not wanted enough to be rich and successful ；otherwise they could not possibly have managed their lives so badly.
I was torn between the desire to help them and change their lives, and the determination not to repeat their mistakes. I had a strong belief in my power to go what I wanted. After months of hard study I won a full college scholarship.(奖学金)My father could hardly contain his pride in me, and my mother eventually gave in before my success.The author was not allowed to go to Cornell University mainly because .
| A．his father graduated from the university |
| B．his mother did not think it a great university |
| C．his parents needed him to help support the family |
| D．his parents did not have enough money for him |
The father started his small shop with the money from.
| A．a local league | B．his university | C．his relatives | D．his college friends |
Why did the mother renew her membership in the league?
| A．To help with her husband’s business |
| B．To raise money for her sonaris. |
| C．To meet her long-forgotten friends |
| D．To better manage her life |
According to the text, what was the author determined to do in that autumn?
| A．To get a well-paid job for himself |
| B．To improve relations with his mother |
| C．To go to his dream university |
| D．To carry on with his father,s business. |
Most people know that Marie Curie was the first woman to win the Nobel Prize, and the first person to win it twice. However, few people know that she was also the mother of a Nobel Prize winner.
Born in September, 1897, Irene Curie was the first of the Curies’ two daughters. Along with nine other children whose parents were also famous scholars, Irene studied in their own school, and her mother was one of the teachers. She finished her high school education at the College of Sévigné in Paris.
Irene entered the University of Paris in 1914 to prepare for a degree in mathematics and physics. When World War I began, Irene went to help her mother, who was using X-ray facilities（设备） to help save the lives of wounded soldiers. Irene continued the work by developing X-ray facilities in military hospitals in France and Belgrum. Her services were recognised in the form of a Military’s Medal by the French government. In 1918, Irene became her mother’s assistant at the Curie Institute. In December 1924, Frederic Joliot joined the Institute, and Irene taugh him the techniques required for his work. They soon fell in love and were married in 1926. Their daughter Helene was born in 1927 and their son Pierre five years later.
Like her mother, Irene combined family and career. Like her mother, Irene was awarded a Nobel Prize, along with her husband, in 1935. Unfortunately, also like her mother, she developed leukemia because of her work with radioactivity（辐射能）. Irene Joliot-Curie died from leukemia on March 17, 1956.Why was Irene Curie awarded a Military Medal?
| A．Because she received a degree in mathematics. |
| B．Because she contributed to saving the wounded. |
| C．Because she won the Nobel Prize with Frederic. |
| D．Because she worked as a helper to her mother. |
Where did Ire ne Curie meet her husband Frederio joliot ?
| A．At the Curie Institute. | B．At the university of Paris |
| C．At a military hospital. | D．At the College of Sevigne. |
When was the second child of Irene Curie and Frederic Joliot born?
| A．In 1932. | B．In 1927. | C．In 1897. | D．In 1926. |
In which of the following aspects was Irene Cuire different from her mother?
| A．Irene worked with radioactivity. | B．Irene combined family and career. |
| C．Irene won the Nobel Prize once . | D．Irene died from leukemia. |
Thirteen vehicles lined up last March to race across the Mojave Desert, seeking a million in prize money. To win, they had to finish the 142-mile race in less than 10 hours. Teams and watchers knew there might be no winner at all, because these vehicles were missing a key part—drivers.
DARPA, the Defense Advanced Research Projects Agency, organized the race as part of a push to develop robotic vehicles for future battlefields. But the Grand Challenge, as it was called, just proved how difficult it is to get a car to speed across an unfamiliar desert without human guidance. One had its brake lock up in the starting area, Another began by throwing itself onto a wall. Another got tied up by bushes near the road after 1.9 miles.
One turned upside down. One took off in entirely the wrong direction and had to be disabled by remote (远距离的) consol. One went a little more than a mile and rushed into a fence; another managed to go for six miles but stuck on a rock. The “winner,”if there was any, reached 7.8 miles before it ran into a long, narrow hole, and the front wheels caught on fire.
“You get a lot of respect for natural abilities of the living things,” says Reinhold Behringer, who helped design two of the ear-size vehicles for a company called Sci-Autonics, “Even ants (蚂蚁) can do all these tasks effortlessly. It’s very hard for us to put these abilities into our machines.”
The robotic vehicles, though with necessary modern equipment such as advanced computers and GPS guidance, had trouble figuring out fast enough the blocks ahead that a two-year-old human recognizes immediately. Sure, that very young child, who has just only learned to walk, may not think to wipe apple juice off her face, but she already knows that when there’s a cookie in the kitchen she has to climb up the table, and that when she gets to the cookie it will taste good. She is more advanced, even months old, than any machine humans have designed.DARPA organized the race in order to ______.
| A．raise money for producing more robotic vehicles |
| B．push the development of vehicle industry |
| C．train more people to drive in the desert |
| D．improve the vehicles for future wars |
From the passage we know “robotic vehicles” are a kind of machines that ______.
| A．can do effortlessly whatever tasks living things can |
| B．can take part in a race across 142 miles with a time limit |
| C．can show off their ability to turn themselves upside down |
| D．can move from place to p1ace without being driven by human beings |
In the race, the greatest distance one robotic vehicle covered was_____ .
| A．about eight miles | B．six miles | C．almost two miles | D．about one mile |
In the last paragraph, the writer implies that there is a long way to go____ .
| A．for a robotic vehicle to finish a 142-mile race without any difficulties |
| B．for a little child who has just learned to walk to reach the cookie on the table |
| C．for a robotic vehicle to deal with a simple problem that a little child can solve |
| D．for a little child to understand the importance of wiping apple juice off its face |
One Sunday, my family had gathered at my parents’ house to feast upon Mom’s wonderful cooking. During the normal dinner chatter (闲聊), I noticed that my father was slurring (说话含混) his words. No one mentioned this during dinner, but I felt compelled to discuss it with my mother afterward.
We decided that there was something seriously wrong and that Dad needed to see the doctor.
Mom phoned me two days later. “The doctor found a brain tumor (肿瘤). It’s too large at this point to operate. Maybe they can do something then, but the odds are long.”
Even with the treatment, my father’s condition worsened, and the doctor finally informed us that this condition was terminal (晚期的). During one of his stays in the hospital, we brought our baby daughter Chelsey with us when we visited him. By this time he had great difficulty speaking. I finally figured out that he wanted Chelsey to sit on his stomach so he could make faces at her.
Watching the two of them together, I realized I was living an experience that would stay with me forever. Though grateful for the times they could share, I couldn’t shake the feeling of a clock ticking in the background.
On the visit to my parents’ home during what we all know was my father’s last days, my mother took Chelsey from my arms and announced, “Your father would like to see you alone for a minute.”
I entered the bedroom where my father lay on a rented hospital bed. He appeared even weaker than the day before.
“How are you feeling, Dad?” I asked. “Can I do anything for you?”
He tried to speak, but he couldn’t make out a word.
“I’m sorry, but I can’t understand you,” I said.
With great difficulty he said, “I love you.”
We don’t learn courage from heroes on the evening news. We learn true courage from watching ordinary people rise above hopeless situations. In many ways my father was a strict, uncommunicative man. He found it difficult to show emotion. The bravest thing I ever saw him do was overcome that barrier to open his heart to his son and family at the end of his life.Which of the following statements is TRUE?
| A．The writer accompanied his father to a medical examination. |
| B．The writer’s father got worse after the removal of the brain tumor. |
| C．The writer was quick to notice the strange condition of his father. |
| D．The writer’s father had known about his illness before the writer discovered it. |
What does the underlined sentence “the odds are long” mean?
| A．There’s little possibility for Father to recover. |
| B．It takes a long time for Father to recover. |
| C．Father needs love and care from his family. |
| D．They need a proper time to operate on Father. |
The father had never said “I love you” to the writer before because ________.
| A．he believed in strictness and punishment |
| B．he was not so attached to the writer |
| C．he thought there was no need to tell the writer |
| D．he was not used to openly showing his emotions |
What does the writer attempt to tell us?
| A．We don’t often value health until we lose it. |
| B．Don’t wait to see a doctor till it is too late. |
| C．Life is short, so live your life to the fullest. |
| D．Bravely express your love for your family. |
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