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题型:阅读理解-阅读单选 难度:0.15 引用次数:248 题号:8822048

Is there a way to turn back the aging process in people? For centuries, people have been looking for a “fountain of youth.” The idea is that if you find a magical fountain, and drink its water, you will not age.

Researchers in New York did not find an actual fountain of youth, but they may have found a way to turn back the aging process. It appears that the answer may be called the hypothalamus, which is part of your brain. It controls important body activities, including growth, the way we process food and so on. Researchers found that hypothalamus neural stem cells (干细胞) also influence how fast aging takes place.

Dongsheng Cai was the leading researcher in a study on aging in mice. He and his team reported their findings. “when the hypothalamus starts aging, particularly the loss of hypothalamus stem cells, so does the body.” he said.

Using this information, the researchers began trying to activate (激活) the hypothalamus in laboratory mice. The results show that the treatment slowed aging in the animals. “When we injected the hypothalamus stem cells to the middle-aged mice, the mice aged slowly and they could also live longer.”

But these results were just from studying mice in a laboratory. If the mice can live longer, does that mean people could have longer lives? The next step is to see if the anti-aging effects also work in human beings. If so, they say the findings could lead to new ways to help doctors identify and treat age-related health problems.

1. Why does the author mention the “fountain of youth” in the first paragraph?
A.To explain what the “fountain of youth” is.
B.To introduce the hypothalamus.
C.To show how to find the “fountain of youth”.
D.To help people find the “fountain of youth”.
2. What does the underlined word “it” in Paragraph 2 refer to?
A.The brain.B.The aging process.
C.Hypothalamus.D.The stem cell
3. What do we know about the study done by Cai?
A.They have found a way to turn back the aging process.
B.The brain controls growth, reproduction and the way we process food.
C.The decrease of hypothalamus stem cells can lead to aging.
D.The finding has been applied to human beings.
4. Which of the following can be the best title of the passage?
A.The Secret of Youth
B.A New Discovery about Aging
C.The Ways of Slowing Down Aging
D.Hypothalamus — the Fountain of Youth

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阅读理解-阅读单选(约430词) | 困难 (0.15)
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【推荐1】We all experience “oh crap” moments. Running into the person you canceled a date with — while you’re on another date. Realizing you hit “reply all”on an e-mail that you’d do anything to have back. Whatever the situation, the first thing you probably do is freak out. Everybody does.

While many of us think that we’re cool in a crisis, science tells us that we seldom are. At the moment we need to be keenly aware of our surroundings, our attention can tunnel in on the scariest thing in the scene, leaving us unaware of the other sights, sounds, and even smells around us. Armed robbers go unidentified because witnesses remember little more than the guns. Our ability to remember the things we do notice also becomes compromised; we can be told something, and two seconds later we’ll forget. And we jump to conclusions. When we’re freaked out, we’re anything but at our best.

These normal human reactions can be reversed. Once you calm down, you’ll face the most routinely ignored challenge of any crisis situation — identifying what the crisis is really about. We tend to misdiagnose problems because we don’t practice for them. Do the thinking ahead of time so you can just find the solution when it’s showtime. This is why flight attendants suggest you find the closest exit before you depart — so you don’t have to go exit shopping after the plane has caught fire or is sinking into a river.     

Performing in a crisis is becoming more important for all of us, for two reasons. Back in the good old days, the reliability of most anything we used or did was far less than it is today. Now think about what happens to our preparedness as the possibility of something bad happening shrinks. Unless we practice what hardly ever happens, our ability to respond when it does happen tends to slip away. Reliability can kill you. Also, the systems we use today are more complex. There are seldom moving parts in plain view that allow us to see when things are about to go wrong. When complex systems lack transparency (透明度,显而易见), serious situations can “come out of nowhere.” We should all learn to breathe, recognize the situation, and carry out the plan that we were smart enough to prepare well in advance.

1. What does the underlined phrase “freak out” mean?
A.Be at one’s best.B.Calm down gradually.
C.Run away immediately.D.Panic or be scared.
2. Why do armed robbers go unidentified?
A.Because the witnesses jump to conclusions.
B.Because the witnesses focus on their scariest thing.
C.Because the witnesses forget what they have been told.
D.Because the witnesses are keenly aware of the surroundings.
3. Why is it more important for us to perform in a crisis today?
A.Because of less reliability and less complexity.
B.Because of more reliability and more complexity.
C.Because of worse transparency and less preparedness.
D.Because of better transparency and more preparedness.
4. What would the passage suggest doing in case a fire breaks out?
A.Taking a deep breath and dialing 119.
B.Staying cool and ignoring the challenge.
C.Calming down and remembering the situation.
D.Performing escaping and rescuing beforehand.
2020-10-23更新 | 891次组卷
阅读理解-阅读单选(约440词) | 困难 (0.15)

【推荐2】The brain has a powerful ability to remember and connect events separated in time. And now, in that new study in mice published in Neuron, scientists at Columbia’s Zuckerman Institute have cast light on how the brain can form lasting links.

The hippocampus-a small, seahorse-shaped region buried deep in the brain-is an important headquarters for learning and memory. Previous experiments in mice showed that disruption (中断) to the hippocampus leaves the animals with trouble learning to associate two events separated by tens of seconds.

“The traditional view has been that cells in the hippocampus keep up a level of continuous activity to associate such events,” said Dr. Ahmed, co-first author of the study. “Turning these cells off would thus disrupt learning.”

To test this view, the researchers imaged parts of the hippocampus of mice as the animals were exposed to two different stimuli (刺激物): a neutral (神经的) sound followed by a small but unpleasant puff of air. A fifteen-second delay separated the two events. The scientists repeated this experiment across several trials. Over time, the mice learned to associate the sound with the soon-to-follow puff of air. Using advanced microscopy, they recorded the activity of thousands of neurons (神经元) , a type of brain cell, in the animals’ hippocampus over the course of each trial for many days.

“We expected to see continuous neural activity that lasted during the fifteen-second gap, an indication of the hippocampus at work linking the auditory sound and the air puff,” said computational neuroscientist Stefano Fusi, PhD. “But when we began to analyze the data, we saw no such activity.” Instead, the neural activity recorded during the fifteen-second time gap was sparse (稀少的). Only a small number of neurons worked, and they did so seemingly at random.

To understand activity, they had to shift the way they analyzed data and use tools designed to make sense of random processes. Finally, the researchers discovered a complex pattern in the randomness: a style of mental computing that seems to be a remarkably efficient way that neurons store information.

“We were happy to see that the brain doesn’t maintain ongoing activity over all these seconds because that’s not the most efficient way to store information,” said Dr. Ahmed. “The brain seems to have a more efficient way to build this bridge.”

In addition to helping to map the circuitry involved in associative learning, these findings also provide a starting point to more deeply explore disorders, such as panic and post-traumatic stress disorder.

1. What can we learn about the hippocampus?
A.It weakens with the memory decline.
B.It is a brain region crucial for memory.
C.It serves as a tool of learning languages.
D.It is involved in the visual area of the brain.
2. According to the passage, the traditional view is that ______.
A.associations of events require continuous neural activity
B.animals have trouble learning to associate two events
C.neural activity can hardly be replaced by associations
D.a 15-second delay is enough to separate two events
3. The new study in mice indicates that ______.
A.continuous activity happens as expected
B.no neurons stay active at intervals of 15 seconds
C.a complex pattern helps the brain learn associations
D.neuronal information is stored in well-designed tools
4. From the last two paragraphs, we can infer that the findings ______.
A.inspire deeper explorations of disorders
B.provide evidence for language learning
C.build a bridge between different parts of the brain
D.help map some aspects of a person’s experiences
2020-07-10更新 | 652次组卷
阅读理解-阅读单选(约420词) | 困难 (0.15)
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【推荐3】I read somewhere that we spend a full third of our lives waiting. But where are we doing all of this waiting, and what does it mean to an impatient society like ours? To understand the issue, let’s take a look at three types of “waits”.

The very purest form of waiting is the Watched-Pot Wait. It is without doubt the most annoying of all. Take filling up the kitchen sink(洗碗池) as an example. There is absolutely nothing you can do while this is going on but keep both eyes fixed on the sink until it’s full. During these waits, the brain slips away from the body and wanders about until the water runs over the edge of the counter and onto your socks. This kind of wait makes the waiter helpless and mindless.

A cousin to the Watched-Pot Wait is the Forced Wait. This one requires a bit of discipline. Properly preparing packaged noodle soup required a Forced Wait. Directions are very specific. “Bring three cups of water to boil, add mix, simmer three minutes, remove from heat, let stand five minutes.”I have my doubts that anyone has actually followed the procedures strictly. After all, Forced Waiting requires patience.

Perhaps the most powerful type of waiting is the Lucky-Break Wait. This type of wait is unusual in that it is for the most part voluntary. Unlike the Forced Wait, which is also voluntary, waiting for your lucky break does not necessarily mean that it will happen.

Turning one’s life into a waiting game requires faith and hope, and is strictly for the optimists among us. On the surface it seems as ridiculous as following the directions on soup mixes, but the Lucky-Break Wait well serves those who are willing to do it. As long as one doesn’t come to rely on it, wishing for a few good things to happen never hurts anybody.

We certainly do spend a good deal of our time waiting. The next time you’re standing at the sink waiting for it to fill while cooking noodle soup that you’ll have to eat until a large bag of cash falls out of the sky, don’t be desperate. You’re probably just as busy as the next guy.

1. While doing a Watched-Pot Wait, we tend to ___________.
A.keep ourselves busy
B.get absent-minded
C.grow anxious
D.stay focused
2. What is the difference between the Forced Wait and the Watched-Pot Wait?\
A.The Forced Wait requires some self-control.
B.The Forced Wait makes people passive.
C.The Watched-Pot Wait needs directions.
D.The Watched-Pot Wait engages body and brain.
3. What can we learn about the Lucky-Break Wait?
A.It is less voluntary than the Forced Wait.
B.It doesn’t always bring the desired result.
C.It is more fruitful than the Forced Wait.
D.It doesn’t give people faith and hope.
4. What does the author advise us to do the next time we are waiting?
A.Take it seriously.
B.Don’t rely on others.
C.Do something else.
D.Don’t lose heart.
5. The author supports his view by _________.
A.exploring various causes of “waits”.
B.describing detailed processes of “waits”.
C.analyzing different categories of “waits”
D.revealing frustrating consequences of “waits”
2017-08-09更新 | 2572次组卷
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