Your brain controls everything you do. It makes it possible for you to think, learn, create and feel; to blink(眨眼)and breathe and for your heart to beat--this fantastic control center is your brain. It is so amazing that a famous scientist once called it “the most complex (复杂) thing we have yet discovered in our universe.”
Can this small grey organ (器官) , which weighs less than one and a half kilos, really do so much? Amazingly, your brain contains about 100 billion neurons (神经元) --it would take you over 3,000 years to count them all. Believe it or not, the activity in your brain never stops. Your neurons create and send more messages than all the phones in the world. And although one neuron create only a little electricity, all your neurons together can produce enough electricity to power a light bulb (灯泡).
So exactly how fast does your brain work? Well, imagine this: a bee lands on your foot. Neurons in your skin send this information to your brain at a speed of more than 240 kilometers per hour, Your brain then uses other neurons to send the message back to your foot to shake the bee off quickly. These neurons can send this information at more than 320 kilometers per hour. No computer has your brain's unbelievable ability to deal with the amount of information coming from your eyes, ears and other sensory organs.
But how does your brain allow you to learn things that you will use in the future? The structure(结构)of your brain changes every time you have a new thought, remember or learn something. For example, riding a bike seems impossible at first, but soon you are able to do it. How? As you practice, your brain sends “bike riding” messages again and again. Soon, the actions are learnt and you are able to ride a bike easily from then on.
1. From the passage we know that neurons ________ .A.receive messages very slowly | B.are only found in your skin |
C.send messages to your brain | D.need electricity to work |
A.compare them with the human brain | B.show how fast they have become |
C.say that computers have no abilities | D.ask people to use computers more |
A.your brain will power a light bulb | B.your heart beats faster |
C.you remember something | D.the structure of your brain changes |
A.all the steps when your brain learns things |
B.what an unbelievable organ the human brain is |
C.how the brain makes people smarter than computers |
D.the things you can do to make your brain work faster |
相似题推荐
【推荐1】As the days are getting colder, you might wish you could magically turn into a bear and spend the winter sleeping. In fact, scientists are looking for ways to let humans hibernate, too!
During hibernation, an animal’s heart rate and breathing slow down. They can save energy when there is little food in the winter months.
Japanese researchers have found the secret behind hibernation—the “Q neurons”. These neurons in animals’ brains can put them into a hibernation state. The researchers also did operations on mice after turning on the mice’s “Q neurons”. It turned out that during hibernation, the operations do less harm to the mice.
According to the team, humans’ “O neurons”cannot be turned on and off as easily as the mice’s. But they are confident in copying the mice’s hibernation in humans. That means we could let people “hibernate”when having operations, causing less damage to their bodies.
In recent years, more scientists are getting to realize the benefits of hibernation. US scientist Katherine Grabek found that when the thirteen-lined ground squirrel hibernates, it cleans out harmful brain plaques that are related to Alzheimer’s in humans. They hope to design some medicine for humans based on this finding. Besides, some studies in bats show that, during hibernation, their bodies age more slowly. This also provides new ideas for making humans live longer in the future, according to New Scientist magazine.
At the same time, scientists have found a lot of fun facts on animals. For example, a bat’s heart rate drops to 25 beats per minute during hibernation—down from 400 when it’s awake. Its breathing slows so much that it might not take a breath for up to an hour! Also, a black bear can go without eating, drinking or going to the bathroom for 100 days. During hibernation, their wounds even heal perfectly.
1. Paragraph 2 introduces _________.A.what is needed for hibernation | B.where animals usually hibernate |
C.what kind of animals hibernate | D.what happens during hibernation |
A.Humans don’t have “Q neurons” as mice do. |
B.It’s difficult to turn on the mice’s “Q neurons”. |
C.It’s impossible for humans to copy the hibernation. |
D.Doing operations in the hibernation state is less harmful. |
A.People can hibernate whenever they like. |
B.People may hibernate to slow down aging. |
C.People may use animals to create new medicine. |
D.People can go without eating or drinking for 100 days. |
A.share some findings on hibernation | B.introduce fun facts on hibernation |
C.show the achievements in operations | D.present a new way of doing operations |
【推荐2】Astronomers can tell just how hot the surface of the moon gets. The side of the moon toward the sun gets two degrees hotter than boiling water. The night side reaches 243 degrees below zero.
In a lunar eclipse the earth’s shadow falls on the moon. Then the moon’s temperature may drop 300 degrees in a very short time.
A temperature change like this cannot happen on the earth. Why does it happen on the moon? Astronomers know that the surface of the moon is dust. On the earth, the rocks store heat from the sun. When the sun goes down, the rocks stay warm. But the dust of the moon cannot store heat. So when the moon gets dark, the heat escapes quickly. The moon gets very cold.
1. Astronomers have found that the moon’s surface is ________.A.always hotter than boiling water | B.either very hot or very cold |
C.usually many degrees below zero | D.about the same as that of the earth |
A.turned away from the sun | B.in the shadow of the sun |
C.in the shadow of the earth | D.in direct sunlight |
A.very quickly | B.by only a few degrees |
C.very slowly | D.only when there is an eclipse |
A.less than those on the moon | B.more slowly than those on the moon |
C.more quickly than those on the moon | D.Both A and B |
A.rock that stores heat | B.dust that stores heat |
C.dust that cannot store heat | D.rock that does not store heat |
【推荐3】Dumb phones are basic phones with very limited(有限的) functionality(功能) compared to smart phones. You can typically only make and receive calls and text messages. And, if you are lucky you can listen to radio and take very basic photos, but certainly not connect to the internet or apps.
Ms. West’s decision to give up her former smartphone two years ago was a spur(心血来潮) of the moment thing. While looking for a replacement phone in a second-hand shop she was attracted by the low price of a “brick phone”.
It cost her just £8. And because it has no smartphone functionality she doesn’t have an expensive monthly data bill(账单) to worry about.
“I didn’t notice until I bought a brick phone how much a smartphone was taking over my life, ” she says. “I had a lot of social media apps on it, and I didn’t get as much work done as I was always on my phone.”
Dumb phones are continuing to enjoy a revival(复兴). Google searches for them jumped by 89% between 2018 and 2021. One report said that global sales of dumb phones were surprisingly one billion units last year, up from 400 million in 2019. This compares to worldwide sales of 1.4 billion smart phones last year, following a 12.5% fall in 2020.
It appears nostalgia has a part to play in the dumb phone revival. Many of us had a dumb phone as our first mobile phone, so it’s natural that we feel a sense of nostalgia towards these classic phones.
Nowadays a smart phone’s ability to connect calls and send short messages is almost a side feature. Your smart phone is your entertainment centre, your news producer, your guiding system, your diary, your dictionary, and your wallet.
Smartphones always want to grab your attention with notices, updates, and breaking news constantly disrupting(扰乱) your day. This can keep you on edge, and it can be troubled.
It makes sense that some of us are now looking for simpler technologies and think that dumb phones might offer a return to simpler times.
1. According to the text, dumb phones ________.A.are similar to smart phones |
B.has only few functionalities |
C.can only receive text messages |
D.can take excellent pictures |
A.A dumb phone is not expensive to buy. |
B.A dumb phone took over her life totally. |
C.The cost of using a dumb phone is low. |
D.With fewer apps, she focused on her work. |
A.Most people prefer dumb phones now. |
B.Smart phones are sold as well as before. |
C.Google searches for dumb phones dropped. |
D.Sales of Dumb phones are better than before. |
A.错觉 | B.利益 | C.怀旧 | D.释然 |
A.To show dumb phones enjoy a rise. |
B.To tell us Ms West’s recent decision. |
C.To encourage us to use smartphones. |
D.To show the development of phones. |
A study in the journal Mayo Clinic Proceedings says that owning a pet, especially a dog, may help keep your heart healthy.
The researchers compared dog owners with everyone else and found that no matter what their age, sex or education level, they benefited (受益) the most in terms of cardiovascular (心血管的) health. The findings has also shown that dog ownership leads to more physical (身体的) activity. ▲ People who walk dogs enjoy an average of half an hour more physical activity a day than those who don’t have a dog. What’s more, owning a pet in general reduces (减少) stress. A dog or cat coming up to you may bring a smile to your face. In addition, the pet ownership makes us more social. Almost 90% of pet owners said that having an animal brings joy to their life and helps them to feel loved. Two-thirds feel their pets connect them to other people, whether it’s meeting neighbors while walking a dog or having something in common to talk about with other cat or bird owners.
Francisco Lopez-Jimenez, one of the lead researchers on the team, said what makes this study so meaningful is that it showed the benefits of having a dog not only just increased physical activity. The study included many factors (因素) that influenced the health of the heart and arteries (动脉), for example, pet-owners have a healthier diet than people who don’t keep a pet — thus contributing to a better cardiovascular health.
1. ________ is the best to fill in the “ ▲ ” in Paragraph 2.A.When your pet is hungry, you are responsible for filling the food bowl. |
B.Most people, especially old people think that their pets provides happiness for them. |
C.When your pet needs to go outside, you’re more likely to head into the fresh air and get moving. |
D.When you are alone watching TV in the midnight, your pet is certainly your best company. |
①being more physically active
②having a healthier diet
③making us less social
④reducing our stress
A.①②③ | B.①②④ | C.①③④ | D.②③④ |
A.listing reasons | B.using old sayings |
C.giving examples | D.making comparisons |
A.the research encourages people to keep dogs |
B.owning a pet may help keep your heart healthy |
C.pet ownership only increases physical activity |
D.owning pets has no disadvantages |
【推荐2】I had an exciting opportunity to attend the celebration organized by UNESCO for Chinese Language Day. At this event, people celebrate and discuss the Chinese language and culture. In 2010, UNESCO made April 20 Chinese Language Day. It happens to be around the Chinese solar term guyu, which symbolizes new life.
When I arrived for the celebration, I was just in time for the Q&A part of the forum (论坛). The forum gave people the chance to ask questions about Chinese language and culture. It was carried out in a mix of Chinese, English and French, which I found really cool. I also got to experience simultaneous interpretation(同声传译)in person and I must say it seems like a really difficult job.
After the forum, we had a party. Many stalls (展位)showed different Chinese cultural activities. There was a stall for the art of calligraphy(书法) and tea, as well as tasting Chinese plum wine (梅酒). All of them had crowds waiting to experience these cultural practices.
________. It is very encouraging to see such an active discussion. To me, this event is important to ensure intercultural communication, which helps people better understand each other. This is one of the things that the UNESCO and the UN work on, with their goal being global peace.
1. The writer attended the celebration on ________.A.May 20 | B.April 20 | C.June 20 | D.July 20 |
A.the forum | B.Chinese language and culture |
C.the simultaneous interpretation | D.the art of calligraphy |
a. ask questions in three different languages
b. enjoy the art of calligraphy and tea
c. taste Chinese plum wine
d. make Chinese plum wine
A.abc | B.abd | C.acd | D.bed |
A.This event is of great value to both China and the world |
B.I’m worried about the future of my language and my culture |
C.Learning Chinese has become popular around the world |
D.We Chinese young people should all work hard to spread our culture |
Queen Elizabeth II, the UK’s longest-serving monarch (君主), died aged 96 at Balmoral Castle in Scotland, on Sept 8. Her eldest son, Charles, has now become Britain’s new monarch, known as King Charles III, reported the BBC. The UK began a 10-day mourning period (哀悼期) on Sept 9. Flags flying from government buildings were half-staff (下半旗). People have been able to see the queen’s coffin (灵枢), first in Edinburgh and London. There it would lie in state for 4 days for people to pay their respects before the state funeral (国葬) on Sept 19, reported the BBC.
“It’s just so heartbreaking,” said Laura Lang, from Georgia, US, seeing the queen’s cortege (送葬队伍) pass her in Edinburgh. “Look, I know the queen is ‘Britain’. But she’s the queen of the world,” Laura told Sky News.
In her 70-year reign (在位), the queen spent her life serving her country and Commonwealth. She supported over 600 charities and had a close link with the public, noted Sky News. In the UK, every Christmas day, people would turn on their TVs to listen to the queen’s Christmas speech. She sent heartfelt messages about important things, like togetherness.
Her death has been felt across the globe. In Washington, the US flag was lowered to half-staff to mark the passing of the queen. In a statement (声明), French President Emmanuel Macron said, “The woman who stood alongside the giants (巨人) of the 20th century on the path of history has left to join them.”
1. How long did Queen Elizabeth II reign?A.For 96 years. | B.For 10 days. | C.For 70 days. | D.For 70 years. |
A.Her funeral was set on Sept 9. |
B.Her eldest son took over her position. |
C.Flags were half-staff for one day to mourn her. |
D.She became the UK monarch 96 years ago. |
A.She doesn’t take the queen as her role model. |
B.The queen once wanted to rule the whole world. |
C.All countries should have such a queen. |
D.People all over the world respect (尊重) the queen. |
A.The queen liked to do charity. | B.The queen loved giving speeches. |
C.The queen was close to the public. | D.The queen often showed up on TV. |
Time: 10:00 am --- 4:00 pm
Address: 1368 Shennan Road
Admission: 8 yuan for Chinese / 15 yuan for foreigners
Thai elephants. Eight elephants from Thailand are entertaining visitors at the Window of the World by riding bicycles, playing basketball, balancing on a beam (梁), dancing and blowing a harmonica (口琴). People are encouraged to lie on the ground and have the elephants step over them. The elephants give three shows a day at 9:30am, 3:30pm and 8:00pm and there is an additional(另外的) show at 1:30 pm at weekends.
Address: West Huaqiaocheng
Admission: 60 yuan
Dancing dolphins. Dolphins leaping from the water to touch a ball, waving their bodies to music, kissing people and doing maths by tapping their tails have made the delphinium(海豚水族馆) in Shenzhen Ocean Park an attraction for children. Seals and sea lions also perform. Hours: 10:30pm, 4:00am, and 7:30pm
Admission: 40 yuan for adults and 20 yuan for children.
1. Mr Smith, who comes from Australia, wants to visit the Long March exhibit. You, a Chinese student, will go with him as an interpreter (翻译). How much will you pay altogether for the admission(允许进入)?
A.16 yuan | B.23 yuan |
C.30 yuan | D.20 yuan |
A.many articles written by famous writers |
B.many things left by the Red Army |
C.books on the Long March |
D.many photos and pictures about the Long March |
A.Riding bicycles | B.Blowing a harmonica. |
C.Doing maths | D.Dancing. |
A.9:30am, 3:30pm , 8:00pm and 1:30 pm |
B.only 1:30 pm |
C.9:30am, 3:30pm , and 8:00pm. |
D.10:30am, 4:00pm , and 7:30 pm |
A.not only dolphins but also seals and sea lions performing |
B.only dolphins perform |
C.seals and sea lions perform |
D.only seals perform |
【推荐2】Suzie goes to her art class on Tuesday and Thursday afternoons. She always looks forward to those days when she can do creative things all afternoon. She loves making bowls and cups out of clay(粘土).
Last month she learned to put pottery(陶器) into a hot oven(炉子), called a kiln, to make it hard and strong. What Suzie likes best about art is the good feeling she gets when she has finished working on a piece of art. And then when she takes it home to show her parents she feels so proud of what she has made.
On Wednesday Suzie wrote an article about why she thought the school should have two short breaks a day rather than one long break. Lots of her friends thought that this would be a good idea too. Many teachers also agreed with Suzie’s suggestion.
The head teacher of the school asked everyone in the school to vote(表决)on Suzie’s suggestion. During the vote, each person in the school had one vote. Together, the school decided that two short breaks would be better than one long break. All of this happened because Suzie wrote about her idea in the school newspaper.
On the day the newspaper comes out, the first thing Suzie does is to check where her article is in the newspaper. And each month, at the beginning of her article, are the words: By Suzanne Jefferson.
On the way home from school yesterday, Suzie got to think about how much art and writing are the same. In art class she thinks of creative things to make, and then spends a lot of time making it look just right.
And when she writes articles for the school newspaper, she thinks of creative things to say, and then spends a lot of time making it sound just right. And when she has finished writing a really good sentence, she feels almost as if she has made a beautiful piece of art.
Suzie rushed home so she could write something shortly before dinner. She already had lots of ideas for next month’s newspaper. And she wanted to make sure that none of her creative ideas floated away before she wrote them down on paper
1. What does Suzie like making ____out of clay?A.plates | B.ovens | C.bowls and cups | D.newspaper |
A.creative things should be learned |
B.the school should have two short breaks a day |
C.everyone in the school to vote on Suzie’s suggestion |
D.students should write something |
A.writing articles | B.making pottery | C.a piece of art | D.creative things |
A.They are both done easily. | B.They are both done difficultly. |
C.They both need to be shown. | D.They both need creative ideas |
“Why does a blind man want to climb up the tower?” I wondered. “Not the view(景色) certainly, maybe he wants to jump.” Thinking of some terrible reasons, I thought I should follow him.
He went up slowly and stopped from time to time. I followed him a few steps behind. When he got to the first corner of the bell tower, I came close to him. “Excuse me,” I said as politely as I could, “but I wonder why you came up.”
He smiled, “Probably climbing up the tower. You have noticed—and yet, not being blind, perhaps you won't—how the sun shines into the tower through the windows here and there, so that one can feel the cool steps suddenly become quite warm, even in winter. But behind the wall there is shadow(阴影). There is no place as good as this for feeling the difference between light(光亮) and darkness. Though I'm blind, I also want to feel the happiness brought by the sunlight. In fact, it isn't my first time to be here.” He said and seemed as glad as a child.
I never thought that even a blind man could have his way to enjoy the beautiful life. But we often pay no attention to its value(价值) because we never notice it. We went down the tower together and I left him. What the blind man said made me think a lot...
1. The underlined word “blind” probably means ________.
A.瞎的 | B.聋的 | C.瘸的 | D.哑的 |
A.see the beautiful view on the top |
B.enjoy the sun shines through the windows |
C.find out why a blind man climbed |
D.look for the shadow behind the wall |
A.find the difference between light and darkness |
B.enjoy the beauty of sunlight in a special way |
C.make his body strong and healthy |
D.see the sun shines into the tower through the windows |
A.be friendly to blind men | B.be always happy like a child |
C.enjoy the beautiful sunlight | D.find and love what life gives us |
【推荐1】Give yourself a test. Which way is the wind blowing? How many kinds of wildflowers can be seen from your front door? If your awareness is as sharp as it could be, you’ll have no trouble answering these questions.
Most of us observed much more as children than we do as adults. A child’s day is filled with fascination, newness and wonder. Curiosity gave us all a natural awareness. But differences that were sharp to us as children become unclear; we are numb (麻木的) to new stimulation (刺激), new ideas. Relearning the art of seeing the world around us is quite simple, although it takes practice and requires breaking some bad habits.
The first step in awakening senses is to stop predicting what we are going to see and feel before it happens. This blocks awareness. One chilly night when I was hiking in the Rocky Mountains with some students, I mentioned that we were going to cross a mountain stream. The students began complaining about how cold it would be. We reached the stream, and they unwillingly walked ahead. They were almost knee-deep when they realized it was a hot spring. Later they all admitted they’d felt cold water at first.
Another block to awareness is the obsession (痴迷) with naming things. I saw bird watchers who spotted a bird, immediately looked it up in field guides, and said, a “ruby-crowned kinglet (红冠戴菊鸟) “ and checked it off. They no longer paid attention to the bird and never learned what it was doing.
The pressures of “time” and “destination” are further blocks to awareness. I came across many hikers who were heading to a distant camp-ground with just enough time to get there before dark. They seldom walked around a bit, to take a moment to see what’s around them. I asked them what they’d seen. “Oh, a few birds,” they said. They seemed to only pay attention to their destinations.
Nature seems to unfold to people who watch and wait. Next time you take a walk, no matter where it is, take in all the sights, sounds and sensations. Think in this way and you will see a new world in your life.
1. According to Paragraph 2, compared with adults, children are more ________.A.anxious to do wonders | B.eager to explore the world around them |
C.likely to develop unpleasant habits | D.understanding to others' feelings |
A.To admit mistakes honestly. | B.To stop complaining all the time. |
C.To follow the teacher's advice. | D.To avoid jumping to conclusions. |
A.They focus on arriving at the camp in time. |
B.The natural beauty isn't attractive to them. |
C.The forest in the dark is dangerous for them. |
D.They are keen to see rare birds at the destination. |
A.open our mind to new things and ideas |
B.get rid of some bad habits in our daily life |
C.use our senses to feel the wonders of the world |
D.try our best to protect nature |
Tracy: Yes. I'm really lucky to have a chance to do so many things that other young people haven't yet.
Interviewer:So Tracy, the first question is—how old were you when you made your first movie, peanuts?
Tracy: Well, I was only four—so I didn't have a big part—and that movie wasn't really successful.
Interviewer: So what was your first successful movie then?
Tracy: Chocolate Aliens. Did you see it?
Interviewer: Yes. My favourite scene was when you cleaned out the fridge for your mum, and you found interesting chocolates in there.
Tracy: Yeah—that was a cool scene, wasn't it?
Interviewer: Have you appeared in any commercials (商业广告) yet, Tracy?
Tracy: Yes, quite a few. The last one was for a chocolate company. I love chocolate, but they made me eat so much. I felt sick after that. I never want to eat chocolate again.
Interviewer: What a pity! Now, tell me about your latest movie—you haven't finished it yet. But do you think you might win an award for this one?
Tracy: Oh, I hope so. But if I don't win this time, maybe I will some day. I'll continue to work hard.
Interviewer: And one last question Tracy—I'd like to ask you if you enjoy being famous.
Tracy: That's a difficult question to answer. I'd like to tell all my young fans that it isn't easy being famous. Mostly, I miss being a kid. So enjoy being a kid, and don't grow up too quickly.
Interviewer: Thanks for coming, Tracy. You're a great kid. I wish you luck in the future.
1. Tracy Lester is .
A.a fourteen-year-old actor | B.a four-year-old actor | C.an interviewer | D.a director |
A.Peanuts | B.Chocolate Aliens | C.a commercial | D.her latest movie |
A.Peanuts | B.Chocolate Aliens | C.Cartoons | D.Commercials |
A.She thinks it’s easy to become famous. | B.She will enjoys being a kid though she is famous. |
C.Being famous brings her all good things. | D.She feels unlucky to do more things than other children. |
A.three | B.four | C.five | D.six |
A.fashion | B.sports | C.news | D.advertising |
【推荐3】If you have no special plans for your holidays, why not spend your time helping others?
Don't listen to people who say the young people today often think only of themselves. It's not true at all. More and more young people in the USA volunteer to spend their school holidays working for others, and they don't do it for money. Here are some of their stories.
Alice Hamilton,17
I'm going to help the Forest Center build new hiking paths in the mountains. It's going to be great-I' ll spend the whole summer living in the tent and breathing the clean mountain air.I'm going to sleep under the stars. It will be a nice sport, and I' ll be able to do something good at the same time.
Jason Moore,18
This summer,I'm going to volunteer with Special House Program. They build good, low-cost houses and sell them to families that are not very rich. They' ll teach me what to do, so I' ll help people and also have a chance to learn how to build houses.
Trish Anderson,16
I'm going to teach kids who have trouble reading.I' ll work for a program called Reading for Life. Every day,I'm going to help kids choose and read books that they like.I want to be a teacher, and I love children and reading, so this is going to be a great experience for me.
1. Young people in the USA volunteer to spend __________ helping others.A.school holidays | B.weekdays | C.every day | D.every summer |
A.sleep under the stars. |
B.breathe the clean mountain air. |
C.spend the whole summer living at home. |
D.help build new hiking paths in the mountains. |
A.likes reading | B.is 18 years old | C.isn't very rich | D.is good at sports |
A.Alice Hamilton | B.Jason Moore | C.Trish Anderson | D.None of them |
A.Reading for Life | B.A Special House Program |
C.The Forest Center | D.Young American Volunteers |