Why are some people more motivated （積極的） to handle difficult things？And is there a way to make doing difficult things easy？To answer this question，we need to look at this：dopamine （多巴胺）.Dopamine is often considered a pleasure molecule （分子）.But that's not quite what it does.Dopamine is what makes us desire things.And it's that desire that gives us the motivation to get up and do things.
In fact，your brain considers something more important than others mainly depending on how much dopamine it's expecting to get.If an activity releases too little dopamine，you won't have much motivation to do it.But if an activity releases a lot of dopamine，you'll be motivated to repeat it，over and over.So which behavior releases dopamine？Any activity where you expect there's a possible reward releases it.
And in today's digital society，we are flooding our brains with unnaturally high amounts of dopamine on a daily basis，even if we don't know it.Some examples of high dopamine behavior include：visiting social media websites，playing video games，etc.
And you might think， "Oh so what？It's not like it's harming me in any way." But you'd be wrong.Our bodies have a biological system called homeostasis （體內(nèi)動(dòng)態(tài)平衡）.Whenever an imbalance occurs，our body adapts to it.Basically your brain gets used to having high levels of dopamine and those levels become your new normal.Thus you develop a dopamine tolerance.This can be a huge problem because the things that don't give you as much dopamine don't interest you any longer.That's why people tend to prefer playing video games or surfing the Internet，compared to studying or working on their business.
But it is possible to make doing difficult things feel easier.Separate yourself from the unnaturally high amounts of dopamine，or at least expose yourself to it far less frequently.Only then will normal，everyday，low dopamine activities become exciting again and you'll be able to do them for longer.That's why you might want to limit your phone and computer usage，along with other high dopamine-releasing behavior.
We are all dopamine addicts （入迷的人） to a certain extent.And that's a good thing because dopamine motivates us to achieve our goals and improve ourselves.But it's up to you to decide where you're going to get your dopamine.Are you going to get it from things that don't benefit you？Or are you going to get it from working on your long-term goals？The choice is yours.
（1）When is dopamine released？ CC
A.When difficult things come into being.
B.When we take pleasure in the behavior.
C.When possible rewards can be obtained.
D.When we have the motivation to do things.
（2）What can we learn from the passage？ DD
A.Dopamine does great harm to our body.
B.It's hard for our body to keep the balance.
C.Dopamine tolerance keeps us away from games.
D.Video games produce more dopamine than study.
（3）What is the purpose of the fifth paragraph？ CC
A.To explain why dopamine is harmful.
B.To introduce the effects of dopamine.
C.To offer solutions to dopamine tolerance.
D.To stress the importance of dopamine.
（4）What is the author's attitude toward dopamine？ AA
A.Objective.
B.Doubtful.
C.Concerned.
D.Negative.
【答案】C；D；C；A
【解答】
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發(fā)布：2024/9/7 4:0:8組卷：5引用：1難度：0.5
相似題
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1．If you see a group of people dancing and singing on the street or in the railway station，you don't need to feel surprised.They are a flash mob（快閃族），which is a group of people who come together suddenly in a public place，do something unusual for a brief period of time，and then quickly break up.They are usually organized with the help of the Internet or other digital communication network.
At a predetermined time，they gather and perform some distractions（消遣）such as waving their hands and exchanging books.Then，they quickly break up before the police can arrive.Using mobile phones the flash mob can change its location if the first one has been replaced for any reason.
Bill Lasik，senior editor of Harper's Magazine，organized the first flash mob in Manhattan in May 2003 and the first successful flash mob came together on June 3，2003--after the first attempt was foiled at Macy's department store.Lasik claimed that the activity was designed to make fun of hipsters（時(shí)髦的人），and call attention to the cultural atmosphere.
Flash mob gatherings can sometimes shock people.Such an activity might seem amusing and untrue，but it also might frighten people who are not aware of what is taking place.Undoubtedly，flash mobs can serve as good political tools in any direction.They also have great economic potential，such as using flash mobs to advertise a product.
The flash mob is now becoming more and more popular.People use it to do many things.For example，in 2009，Michael Jackson's fans took part in a flash mob to remember him.Hundreds of his fans gathered singing and dancing Michael's famous song Beat It together.Flash mobs give people from all walks of life an opportunity to come together to create a memory.
（1）The underlined word "foiled" in Paragraph 2 can be replaced by "".
A．forgotten
B．prevented
C．a(chǎn)nnounced
D．confirmed
（2）What can you learn about the flash mob from the passage？
A．The flash mob usually breaks up quickly for lacking enough time.
B．Once the place for the activity is determined，it can't be changed.
C．The flash mob can be made use of in many fields for fun.
D．It gives people the chance to come together to do something unusual.
（3）The main purpose of the passage is to.
A．entertain
B．encourage
C．inform
D．persuade
（4）The writers attitude towards the flash mob is.
A．negative
B．objective
C．favorable
D．doubtful發(fā)布：2024/12/20 8:0:13組卷：17引用：2難度：0.5 -
2．The world is a greener place than it was 20 years ago．Recent NASA satellites data（2000-2017）have shown that human activities in China and India dominate this greening of the planet，thanks to ambitious tree-planting programmes in China and intensive agriculture in both countries．
The researchers from Boston University found that global green leaf area has increased by 5 percent in the new century，an area equal to all of the Amazon rainforest．China alone accounts for 25% of the global net increase in leaf area with only 6.6% of global vegetated area．China's contribution comes in large part from its programmes to conserve and expand forests，taking up about 42 percent of the greening．The greening from farmlands in China is about 32%，but that in India is about 82%．
Rama Nemani，a research scientist at NASA's Ames Research Centre and a co-author of the study said， "When the greening of the Earth was first observed，we thought it was due to a warmer，wetter climate and fertilization from the added carbon dioxide in the atmosphere．But with data from NASA satellites，scientists realized that humans are also contributing，which was all against our expectations．"
Nemani sees a positive message in the new findings． "Once people realize there is a problem，they tend to fix it，" he said． "In the 1970s and 1980s in India and China，the situation around vegetation loss was not good．In the 1990s，people realized it，and today things have improved．Humans are incredibly resilient．That is what we see in the satellite data．"
However，the researchers rang bells as well．They said that the gain in global greenness did not necessarily make up for the loss of natural vegetation in regions like Brazil and Indonesia．
（1）What is the second paragraph mainly about？
A．The decreasing size of the Amazon rainforest．
B．China's bigger contribution to global greening．
C．Total global green leaf area in the new century．
D．China's programmes to conserve and expand forests．
（2）What surprised scientists regarding global greening？
A．Human activities．
B．Suitable for analyzing data．
C．A warmer and wetter climate．
D．Carbon dioxide in the atmosphere．
（3）What does the underlined word "resilient" probably mean？
A．Good at making programmes．
B．Suitable for analyzing data．
C．Able to make corrections．
D．Active in planting trees．
（4）What does the last paragraph imply？
A．It is urgent to protect global natural resources．
B．Much remains to be done for global greenness．
C．Brazil and Indonesia lose most of their vegetation．
D．Global greenness needs all countries to work together．發(fā)布：2024/12/20 5:0:3組卷：7引用：1難度：0.6 -
3．Our dog Sandy is a golden retriever（尋回犬）.Once we performed an experiment to see how keen his nose was.There was one particular pile that must have had hundreds of sticks.We picked up one stick carved an X on it，walked away from the pile and then threw it back into the pile，not once but a dozen times into the pile.It was impossible for us to tell with any certainty which slick we had originally chosen.Each time he brought back that stick，It wasn't the shape or the size or the look of the stick that he used to pick it out from all the others.It was the smell we left on the stick.It is hard to imagine，hut for dogs every living creature has its own distinctive smell.
The noses of people have about 5 million cells that sense smell.Dogs' noses have anywhere from 125 to 300 million cells.Moreover，these cells are closer to the surface than cells in our noses，and more active.It has been estimated that dogs such as Sandy have noses that are a million times more sensitive than ours.Clothes that we haven't worn for weeks，and places we've only touched lightly indicate our presence to dogs.
His ears are also remarkable.He can hear sounds that humans can't and at distances which are astonishing.It is over our head to know and understand that world.Yet we have the advantage of being able to imagine what his experience is like，though he probably doesn't think too much about how we see the world.
The environment is the world that all living things share.Living creatures are born into the environment and are part of it.Yet there is no creature who perceives（感知到）all of what is and what happens.For a dog like Sandy a book isn't much different than a stick，whereas for us one stick is pretty much like every other stick.There is no one world experienced by all living creatures.
（1）Why did the author conduct the experiment？
A．To train Sandy to pick out sticks.
B．To show how fast Sandy found sticks.
C．To prove sensitivity of Sandy's nose.
D．To teach Sandy to tell different smells.
（2）What does the author intend to do in paragraph 2？
A．Support the conclusion with numbers.
B．Summarize the previous paragraph.
C．Provide some advice for the readers.
D．Introduce a new topic for discussion.
（3）What does the underlined idiom in paragraph 3 mean？
A．Amazing.
B．Difficult.
C．Reasonable.
D．Inconvenient.
（4）Which of the following best expresses the authors opinion in the last paragraph？
A．Worlds to experience.
B．An environment to share.
C．No environment，no creatures.
D．One environment，many worlds.發(fā)布：2024/12/18 14:30:1組卷：5引用：2難度：0.5
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