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题型:阅读理解-六选四 难度:0.4 引用次数:42 题号:14611824

As we age, our ability to think and remember stars to deteriorate. It is normal for old age to be associated with gradual decline in memory and brain mass.     1     Some of us have brains that age more slowly. Super-agers are people over the age of 80 who have the brain structures and abilities of much younger people. Eighty-seven-year-old Bill Gurolnick is such a super-ager.

Scientists know that parts of the brain decrease in size with age. But in super-agers that process is much slower. Emily Rogalski is a neuro-scientist at Northwestern University's Feinberg School of Medicine, in Chicago, Illinois. In a recent study, she showed that super-agers have young brains. The area of the brain responsible for attention and memory -- the cortex (脑皮层)— was shown to be thicker in super-agers.

"When we look at the cortex of their brain, we see that, on average, it looks more like a 50-year-old brain than it looks like an average 80-year-old brain."

    2     These large brain cells appear to be involved with social-emotional communication. But their exact purpose is still a mystery. Scientists writing for Smithsonian magazine also call them spindle neurons (纺锤体神经元), and say they are "brain cells for socializing."

Several factors affect how our brains age. Scientists say super-agers have several things in common, including an active lifestyle. Many travel and play sports. They are often big readers.     3    .

Super-agers also seem to have certain common personality traits. Rogalski says they are, for the most part, known for their optimism, resilience and perseverance. Growing old, she adds, does not have to be depressing and sad. "Perhaps, if we expected a bit better from ourselves, then we would understand that not all aging is doom and gloom."

    4     That they are special and few. She says she wants to find out the reasons Gurolnick's mind is working so well and not aging as quickly as most.

Gurolnick's own father was diagnosed with Alzheimer's in his fifties Solving this mystery, Rogalski says, may help those who suffer from brain diseases such as Alzheimer's.

"We think if we can understand the factors contributing to super-aging, it may offer new hypotheses and new ways to explore the challenges in Alzheimer's disease."

A.Nowadays scientists are peeking into the brains of these "super-agers" to uncover their secret.
B.As lead investigator of the study, Rogalaski jokingly said that super-agers do not grow on trees.
C.And they usually have healthy relationships and spend time with friends.
D.Not only do super-agers have thicker cor-texes, they have more von Economo neurons.
E.However, there are reports of individuals who seem immune to age-related memory impairment.
F.It's pretty extraordinary for people in their 80s and 90s to keep the same sharp memory as someone several decades younger.
【知识点】 科普知识 说明文

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【推荐1】When we see cute babies, or adorable baby animals, many of us feel a strong urge to squeeze or pinch them or even bite them. Scientists call this strange response “cute aggression”.

Stavropoulos’s team gathered 54 people to look at 32 pictures of four sets. One set contained photos of cute baby animals. Another set contained pictures of less-cute, fully grown animals. The other two sets were photos of human babies which were digitally edited. One set was changed to emphasize features we find cute, such as big eyes and full cheeks. The other was edited to reduce those features.

The scientists found that the participants had much more feelings of cute aggression towards images of baby animals than those of adult animals. Surprisingly, this difference was not seen from the two sets of human baby pictures in comparison.

To assess cute aggression, the participants were asked questions about the degree of wanting to aggress the subjects of the photos, and of wanting to care for them. Scientists suspect these rosponses are associated with not only the brain’s emotional systems, but also its reward systems, which adjust motivation, pleasure and feelings of “wanting”.

Cute aggression may give humans the highly adaptive ability to control emotional response. To limit the motivation of positive feelings, the brain gives commands of the aggression. In other words, the brain throws in a bit of aggression to keep the good feelings from becoming uncontrolled. “If you find yourself fascinated by how cute a baby is, -so much so that you simply can’t control it-that baby is going to starve.” It stops us from investing too much energy into cute things. So, there is no need to feel bad for the desire to pinch them at the sight of cute babies. It’s not because we’re mean people. The “unfriendly” movement of our fingers is just our brain’s way of making sure nothing gets too cute to handle.

1. What was found in Stavropoulos’s experiment?
A.Human’s brain has two systems.
B.Cute aggression exists in every human being.
C.Cute aggression varies towards different subjects.
D.Humans like to aggress animals rather than care for them.
2. How does Stavropoulos find cute aggression?
A.It is a normal response in the brain.B.It is still a mystery.
C.It does harm to the animals.D.It makes humans become mean.
3. What is the author’s attitude towards cute aggression?
A.DoubtfulB.SupportiveC.DisapprovingD.Unclear
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文章大意:本文是一篇说明文。文章介绍了虽然抱负在个人生活中是必要的,但是它也有几个缺点。

【推荐2】Ambition (志向,抱负) is a necessary quality in life. It is the force which drives us on to use whatever talent we have got.     1    , these talents will not be used for our own and others’ benefit. Without ambition we are just jellyfish that flop though life. We only react to events: we don't try to control them.

    2    . First of all, it can be unrealistic. We may not be able to see the limits of our own abilities, so we do ambitious things that are completely beyond us. Some people can see our good qualities and our limitations objectively. They may tell us that we haven’t the ability We refuse to take their evaluation. We keep on trying. Many years and many disappointments later we are forced to accept their judgment. But what a waste of time our ill-founded ambition has caused us!

Besides, our ambition can be too concentrated. We devote our attention to one narrow aim, such as getting distinctions in our science subjects. Everything that may draw us away from this aim is cutout of our lives. In the end we get our distinctions. But we are isolated beings who only care about particular examination. And we probably won’t make good scientists.     3    .

And our ambition can be limited to lifeless objectives.    4    . Persons who feel inferior try to make up by seeking the respect of others through owning these artificial signs of worth.

    5    . But, like all blind forces, it must be directed if not to cause disaster.

A.Still, ambition can have several disadvantages
B.Because our ambition may make us among selfish people
C.Unless we have got some degree of ambition
D.Since we don’t have the breadth of view necessary for greater success
E.Ambition is necessary in the lives of individuals
F.As long as tightly controlled by the head and the heart
G.We want to gain money, or power, or membership of some circles
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【推荐3】Directions: Read the following passage. Fill in each blank with a proper sentence given in the box. Each sentence can be used only once. Note that there are two more sentences than you need.

Most people don’t need science to appreciate the importance of a mother’s love.

But to understand how early maltreatment can derail a child’s development requires careful study. In a famous research, Harry Harlow had demonstrated that proper psychological and physical development of infants requires nurturing and attention from a parent.     1     In that research, socially isolated monkey babies that were removed from their mothers were found to be clinging to a cloth-covered surrogate(替代的) mother for comfort.

Such experimentations sound cruel. They, however, have been critical in helping change policies in human orphanages( 孤儿院 ) in the U.S. For centuries some orphanages treated infants equally inhumanely. Despite early evidence that orphanage infants were far more likely to die than others, supporters argued that it didn’t matter whether children had “parents” specially devoted to them at the orphanage.     2     Orphans were supposed to be in positive mental and physical health until adoptive parents were found. Babies, they said, couldn’t remember anyway.

The harrowing consequences of these theories were most vividly brought to light in Romania in the 1980s and ‘90s. A ban on abortion(流产 ) led to a surge in orphanage babies. Simply being fed and changed without individualized affection, some babies present serious problems. Many developed violent behaviors, repetitively rocking or banging their heads. Some were cold and withdrawn or indiscriminately affectionate.     3     Their head sizes were especially small.

They even had problems with attention and comprehension. The longer these children were left alone, the more damage was seen.

The lack of a secure attachment relationship in the early years has destructive consequences for both physical and mental health later in life, with long-lasting effects. The persistence of these effects emphasizes the need to intervene early in life. The Nobel-prize-winning economist James Heckman, has long argued that investing in early childhood education provides a greater return for society than virtually any other type of spending. It is obviously reflected in increased educational success and productivity,. The reduced crime, addiction, distress and disorder point to the same theory. Early life conditions critically affect adult life.     4     Remove it and the harm is great.

A.The appropriate feeding and caring styles were greatly rewarded in all aspects.
B.It was claimed that simply feeding and changing them would be adequate.
C.Some, however, demonstrate little influence with roughly ordinary behavior pattern.
D.Maternal attachment plays a fundamental role in shaping who we are.
E.Necessities are not just the availability of food and water.
F.And they simply didn’t grow like normal infants.
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