Youngpeoplecanhaveproblemswith-优题课

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Motherhood may make women smarter and may help prevent dementia(痴呆) in old age by bathing the brain in protective hormones(荷尔蒙) , U.S. researchers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s(早老痴呆症). University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
“Our research shows that the hormones of pregnancy(怀孕) are protecting the brain, including estrogen(雌激素), which we know has many neuroprotective (保护神经的) effects,” Kinsley said.
“It’s rat data but humans are mammals just like these animals are mammals,” he added in a telephone interview. “They go through pregnancy and hormonal changes.”
Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.
“When people think about pregnancy, they think about what happens to babies and the mother from the neck down,” said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.
“They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic changes to the brain.”
51. How do scientists know “Motherhood may make women smarter”?
A. They know it by experimenting on rats. B. Many women say so.
C. Some researchers have told them. D. They know it through their own experience.
52. What does the phrase “litters of pups” mean in the second paragraph?
A. Old rats. B. Animals. C. Baby rats. D. Grown-up rats.
53. What can protect the brain of a woman according to the passage?
A. Estrogen. B. Taking care of children.
C. More exercise. D. The hormones of pregnancy.
54. “It’s rat data but humans are mammals just like these animals are mammals.” What does the sentence suggest?
A. The experiments on the rats are much the same on humans.
B. The experiments on the rats are very important for animals.
C. The experiments on the rats have nothing to do with humans.
D. The experiments on the rats are much the same on other animals.
55. Which title is the best for this passage?
A. Do You Want to Be Smarter? B. An Important Study
C. Mysterious Hormones D. Motherhood Makes Women Smarter

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Five years ago, David Smith wore an expensive suit to work every day. “I was a clothes addict,” he jokes. “I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled.” Today David wears casual clothes-khaki pants and sports shirt-to the office. He hardly ever wears a necktie. “I’m working harder than ever,” David says, “and I need to feel comfortable.”
More and more companies are allowing their office workers to wear casual clothes to work in the United States. The change from formal to casual office wear has been gradual. In the early 1990s, many companies allowed their employees to wear casual clothes on Friday (but only on Friday). This became known as “dress-down Friday” or “casual Friday”. “What started out as an extra one-day-a-week benefit for employees has really become an everyday thing.” said business consultant Maisly Jones.
Why have so many companies started allowing their employees to wear casual clothes? One reason is that it’s easier for a company to attract new employees if it has a casual dress code. “A lot of young people don’t want to dress up for work,” says the owner of a software company, “so it’s hard to hire people if you have a conservative dress code.” Another reason is that people seem happier and more productive when they are wearing comfortable clothes. In a study conducted by Levi Strauss and Company, 85 percent of employers said that they believe that casual dress improves employee morale. Only 4 percent of employers said that casual dress has a negative impact on productivity. Supporters of casual office wear also argue that a casual dress code helps them save money. “Suits are expensive, if you have to wear one every day,” one person said. “For the same amount of money, you can buy a lot more casual clothes.”
46. David Smith refers to himself as having been “a clothes addict” because _______.
A. he often wore khaki pants and a sports shirt
B. he wanted his clothes to look neat all the time
C. he couldn’t stand a clean appearance
D. he didn’t want to spend much money on clothes
47. The reason why David Smith wears casual clothes now is that _______.
A. they make him feel at ease when working
B. he cannot afford to buy expensive clothes
C. he looks handsome in casual clothes
D. he no longer works for any company
48. Which of the following statements cannot be inferred from the passage?
A. All the employers in the U. S. show their approval for casual office wear.
B. Comfortable clothes increase employees’ productivity.
C. A casual clothes code is welcomed by young employees.
D. Many employees don’t like a conservative dress code.
49. According to this passage, which of the following statements is true?
A. Company workers started to dress down about twenty years ago.
B. “Dress-down Friday” was first given as a favor from employers.
C.Dress-down has become an everyday phenomenon since the early 1990s.
D. Many workers want to wear casual clothes to impress people.
50. In this passage, the following advantages of casual office wear are mentioned in the passage except ___.
A. saving employees’ money B. making employees more attractive
C. improving employees’ motivation D. making employees happier

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III．阅读(共两节，满分40分)
第一节：阅读理解(共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(A、B、C、和D)中选出最佳选项。
Qian Xuesen is one of the pioneers of China's space science. As a world-famous expert on aerospace rockets and aerodynamics, he obtained great achievements in the areas of applied mechanics, engineering cybernetics and system engineering and made distinguished contributions to the foundation and development of Chinese aerospace undertaking(事业).
Graduated from Shanghai Jiaotong University in 1934, Qian Xuesen went to the United States to study in MIT, Massachusetts Institute of Technology, one year later. After receiving master's degree in MIT, he went to study in California Institute of Technology and received PhD degrees in both aerospace and mathematics.
In 1955, six years after the founding of People's Republic of China, Qian Xuesen returned to his motherland. His return brought China the hope of developing space science and its own missiles.
In 1956, Qian Xuesen put forward “Proposal on the Development of China's Aviation Industry for National Defense”. With the support from Zhou Enlai, the premier, and marshal Nie Rongzheng, Qian Xuesen began to prepare for the establishment of China's first missile and rocket research and development structure, the Fifth Research Institute of State Ministry of Defense. Henceforth（从此以后）, he has long been in charge of the chief technological research and development of China's missile, rocket and spacecraft.
Due to research and development led by Qian Xuesen, China successfully exploded its first atom bomb in 1964. Later, China launched its first man-made satellite, Dong Fang Hong I, to the earth orbit on April 24, 1970, becoming the fifth country in the world to independently launch satellite following the former Union of Soviet Socialist Republics, the USA, France and Japan. The satellite floated around the earth, blaring（高声播放） the song Dong Fang Hong, which has the same name as the satellite.
As a forerunner leading the development of China's aerospace science and technology, Qian Xuesen also provided chances for young scientists. Wang Yongzhi, former chief designer of China's manned-space project, has benefited a lot from Qian Xuesen. “He suggested that rocket of the second generation should be developed by our second generation scientists. This suggestion gave us chances to be general designers.” Recalling the experience working with Qian Xuesen, Sun Jiadong, general designer of China's lunar orbiter project, is very grateful. “He put great expectation on us and trusted us a lot. Whenever we made mistakes, he seldom blamed us, but helped us to find out the reason so we could avoid it in the future.”
Honored as Father of China's Missile and King of Rockets, Qian Xuesen never stopped his work on scientific research after he retired. He said he had no time to review the past, but looked forward to the future.
41. When did Qian xuesen begin to study in Massachusetts Institute of Technology?________
A. In 1955. B. In 1935. C. In 1936. D. In 1934.
42. Which of the following is about the five countries that launched man-made satellite independently before 1970?
A. The former Union of Soviet Socialist Republics, the UK, France, China and Japan.
B. The former Union of Soviet Socialist Republics, the USA, Japan, Canada and China.
C. America, France, Japan, China and Australia.
D. The former Union of Soviet Socialist Republics, America, France, Japan and China.
43. What does the underlined word “forerunner”(Paragraph 6) probably mean?
A. A leader. B. A pioneer. C. A competitor. D. A successful scientist.
44. According to the passage, which of the following about Qian Xuesen is NOT true?
A. In 1956, he made good preparations for the Fifth Research Institute of State Ministry of Defense.
B. He made outstanding contributions to the establishment and development of Chinese aerospace undertaking.
C. He returned to China, bringing China the hope of developing space science and its own missiles.
D. He devoted all his life to China’s space science.
45. It can be inferred from Paragraph 6 that ______.
A. Qian Xuesen is very concerned about the development of young scientists.
B. The help of Qian Xuesen is beneficial to young scientists.
C. Qian Xuesen gives many opportunities to general designers.
D. When the chief designers do something wrong, Qian Xuesen helps them find out the cause.

Losing a baby tooth can be fun for a kid. You can put it under your pillow and look forward to finding some money there in the morning. And then you can watch your new permanent(永恒的) tooth grow in its place.
But if a permanent tooth falls out, that’s a problem. There isn’t another one under the gum(齿龈)that can replace it. Unfortunately, this happens to some older people. And if permanent teeth fall out or need to be pulled, an older person might need dentures.
Dentures, known as false teeth, are a set of replacement teeth for any teeth that are missing. There are partial dentures, which take the place of only a few teeth and prevent the others from changing position. If all the teeth are gone, the person would need complete dentures, which replace every tooth in the mouth.
Dentures can cause pains at first and take little time to get adjusted to. They also need special care. They should be brushed daily with a special denture brush and cleanser and soaked in denture solution when not in the mouth.
Dentures are important for older folks because, without teeth, it’s hard to smile, talk, and eat properly. But it can be a little weird if you see someone take out his or her dentures. It can also be strange to see someone, like a grandparent, without dentures in because he or she won’t have any teeth. Try not to make fun of the person because this could cause hurt feelings.
People usually lose their permanent teeth due to periodontal disease, or gum disease, which is caused by bacteria that attacks the gums. Diseased gums aren’t strong and healthy, so teeth can get loose and fall out. Older people often have many cavities(洞)that have been filled over the years, and these fillings can weaken over time, leading to more tooth decay.
67．If one of your baby teeth falls out, you.
A．should have a false tooth fixed in its place
B．have to put it under your pillow at once
C．will gain a permanent tooth in future
D．can exchange it for some money
68．A person wearing dentures .
A．should brush them with a special denture brush every few days
B．will take a very long time to adjust himself or herself to them
C．will experience unpleasant feelings at the beginning of fixing them
D．should use denture solution to soak them in his or her mouth
69．Which of the following is NOT true according to the passage?
A．Partial dentures can prevent the remaining teeth from changing position.
B．Old people will find it hard to smile, talk, and eat properly without teeth.
C．A person’s teeth will possibly get loose if diseases strike his gums.
D．It is hard for a person to wear dentures if all his teeth have fallen out.
70．What does the underlined word “weird” mean in the fifth paragraph?
A．inconvenient B．excited C．uncomfortable D．impolite

During the twentieth century there has been a great change in the lives of women. A woman marrying at the end of the nineteenth century would probably have been in her middle twenties, and would be likely to have seven or eight children, of whom four or five lived till they were five years old. By the time the youngest was fifteen, the mother would have been in her early fifties and would expect to live a further twenty years, during which chance and health made it unusual for her to get paid work. Today women marry younger and have fewer children. Usually a woman’s youngest child will be fifteen when she is forty-five and can be expected to live another thirty-five years and she is likely to take paid work until sixty.
This important change in women’s life has only recently begun to have its full effect on women’s economic（经济的） position. Even a few years ago most girls left school and took a full-time job. However, when they married, they usually left work at once and never returned to it. Today the school-leaving age is sixteen; many girls stay at school after that age, and though women marry younger, more married women stay at work at least until shortly before their first child is born. Many more afterwards return to full-time or part-time work. Such changes have led to a new relationship in marriage, with the husband accepting a greater share of the duties and satisfactions of family life.
63. We are told that in a typical family in about 1900________.
A. few children died before they were five
B. seven or eight children lived to be more than five
C. the youngest child would be fifteen
D. four or five children died when they were five
64. One reason why the woman of today may take a job is that she _______________.
A. is younger when her children are old enough to look after themselves
B. does not like children herself
C. needn’t worry about food for her children
D. can be free from family duties when she reaches sixty
65. Many girls are now likely to _______________________.
A. give up their jobs after they are married
B. leave school as soon as they can
C. marry so that they can get a job
D. continue working until they are going to have a baby
66. According to the passage, it is now quite common for women to______________.
A. stay at home after leaving school
B. marry men younger than themselves
C. start working again later in life
D. marry while still at school

A．he was afraid of his teacher	B．he was so worried about his studies
C．he wanted to frighten his parents	D．his finger was badly hurt

A．she had exams	B．she studied very hard
C．she talked with her parents	D．she thought of something