C
When an ant dies, other ants take it out of the nest, often within an hour after its death. This behavior interests scientists and they wonder how ants know for sure--and so soon--that another ant is dead.
One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist, a scientist who studies animals and plants. He found that ants have a chemical on the outside of their bodies that signals to other ants, “I’m dead--take me away” when it is dead.
One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist, a scientist who studies animals and plants. He found that ants have a chemical on the outside of their bodies that signals to other ants, “I’m dead---take me away” when it is dead.
But there's a question to answer: As we know, if an ant is dead, it stops moving. But when an ant is sleeping or knocked unconscious, it is also not moving. However, other ants don't move the living ant out of the nest. How do they know this ant is not dead? Choe found that ants have another chemical on their bodies, which tells nearby ants something like, “Wait—I'm not dead yet” when it is not dead. Choe suspects that when an ant dies, the chemical that says, “Wait— I'm not dead yet” quickly goes away. When other ants detect the “dead” chemical without the “not dead yet” chemical, they move away the body.
To test his theory, Choe and his team put different chemicals on ants. When the scientists used the “I'm dead” chemical, other ants quickly moved the treated ant away. When the scientists used the “Wait—I'm not dead yet” chemical, other ants left the treated ant alone. Choe believes this behavior shows that the “not dead yet” chemical overrides the “dead” chemical when picked up by other ants. And that when an ant dies, the “not dead yet” chemical fades away. Other nearby ants then detect the remaining “dead” chemical and remove the body from the nest.
Understanding this behavior can help scientists figure out how to stop ants from invading new places and causing problems.What is the function of the first paragraph?
| A．Leading the following paragraphs. |
| B．Showing the main idea of the passage. |
| C．Introducing the background of the passage. |
| D．Giving a summary of the passage. |
Which of the following has the closest meaning to the underlined word “overrides” in the fourth paragraph?
| A．is weaker than | B．is stronger than | C．is better than | D．is worse than |
What can we learn from the passage?
| A．Living ants can also be taken away when they are not moving. |
| B．When an ant dies, it can tell others using a certain chemical. |
| C．A living ant can pretend to be dead using a special chemical. |
| D．Ants often use chemicals to communicate with each other. |
Which of the following descriptions about Dong-Hwan Choe is right?
| A．Choe did this study in order to stop ants from invading new places. |
| B．Choe is a biologist who is only interested in animals, especially in ants. |
| C．Choe first came up with an idea to explain this ant behavior，and then did some tests to prove his theory. |
| D．Choe did the research on this ant behavior on his own. |
Many people think of the brain as a mystery.They don't know much about intelligence and how it works.When they do think about what intelligence is，many people believe that a person is born smart，average，or dumb—and stays that way in the whole life.But new research shows that the brain is more like a muscle—it changes and gets stronger when you use it.And scientists have been able to show just how the brain grows and gets stronger when you learn.
Everyone knows that when you lift weights，your muscles get bigger and you get stronger.A person who can't lift 20 pounds when he/she starts exercising can get strong enough to lift 100 pounds after working out for a long time.That's because the muscles become larger and stronger with exercise.And when you stop exercising，the muscles shrink and you get weaker.That's why people say “Use it or lose it！”
But most people don't know that when they practice and learn new things，parts of their brain change and get larger a lot like muscles do when they exercise. Inside the cortex(皮层)of the brain are billions of tiny nerve cells，called neurons. The nerve cells have branches connecting them to other cells in a complicated network. Communication between these brain cells is what allows us to think and solve problems. When you learn new things，these tiny connections in the brain actually multiply and get stronger.The more you challenge your mind to learn，the more your brain cells grow.Then，things that you once found very hard or even impossible to do—like speaking a foreign language or doing algebra(代数)—seem to become easy after learning them for a period of time.The result is a stronger，smarter brain.
Scientists started thinking that the human brain could develop and change when they studied animals'brains.They found out that animals that lived in a challenging environment were more perspicacious—they were better at solving problems and learning new things.According to the first paragraph，________.
| A．the function of our brain is like that of the muscle |
| B．until now it's impossible to explain the brain's mystery |
| C．many people believe one's intelligence is naturally determined |
| D．one's brain grows stronger as the age increases |
Training muscles is compared to ________.
| A．using the brain |
| B．connecting things in your brain |
| C．lifting weights |
| D．doing research about the brain |
What does the underlined word“perspicacious”in the last paragraph probably mean?
| A．Strong. | B．Smart. |
| C．Popular. | D．Active. |
The following paragraph will most probably talk about ________.
| A．the differences between animals'brains and humans'brains |
| B．the relation between human brains and muscles |
| C．scientists' findings about animals' brains |
| D．how to make your brain smarter through selfdevelopment |
Some people think that success is only for those with talent or those who grow up in the right family，and others believe that success mostly comes down to luck.I'm not going to say luck，talent，and circumstances don't come into play because they do.Some people are born into the right family while others are born with great intelligence，and that's just the reality of how life is.
However，to succeed in life，one first needs to set a goal and then gradually make it more practical.And，in addition to that，in order to get really good at something，one needs to spend at least 10,000 hours studying and practising.To become great at certain things，it'll require even more time，time that most people won't put in.
However，to succeed in life，one first needs to set a goal and then gradually make it more practical.And，in addition to that，in order to get really good at something，one needs to spend at least 10,000 hours studying and practising.To become great at certain things，it'll require even more time，time that most people won't put in.
This is a big reason why many successful people advise you to do something you love. If you don't enjoy what you do，it is going to feel like unbearable pain and will likely make you quit well before you ever become good at it.
This is a big reason why many successful people advise you to do something you love. If you don't enjoy what you do，it is going to feel like unbearable pain and will likely make you quit well before you ever become good at it.
When you see people exhibiting some great skills or having achieved great success，you know that they have put in a huge part of their life to get there at a huge cost.It's sometimes easy to think they got lucky or they were born with some rare talent，but thinking that way does you no good，and there's a huge chance that you're wrong anyway.
Whatever you do，if you want to become great at it, you need to work day in and day out，almost to the point of addiction，and over a long period of time.If you're not willing to put in the time and work，don't expect to receive any rewards.Consistent, hard work won't guarantee you the level of success you may want, but it will guarantee that you will become really good at whatever it is you put all that work into.Paragraph 1 mainly talks about ________.
| A．the reasons for success |
| B．the meaning of success |
| C．the standards of success |
| D．the importance of success |
Successful people suggest doing what one loves because ________.
| A．work makes one feel pain |
| B．one tends to enjoy his work |
| C．one gives up his work easily |
| D．it takes a lot of time to succeed |
What is the main theme of the passage?
| A．Having a goal is vital to success. |
| B．Being good is different from being great. |
| C．One cannot succeed without time and practice. |
| D．Luck，talent and family help to achieve success. |
What is the main theme of the passage?
| A．Having a goal is vital to success. |
| B．Being good is different from being great. |
| C．One cannot succeed without time and practice. |
| D．Luck，talent and family help to achieve success. |
Does Fame Drive You Crazy?
Although being famous might sound like a dream come true, today's stars, feeling like zoo animals, face pressures that few of us can imagine.They are at the center of much of the world's attention.Paparazzi (狗仔队) camp outside their homes, cameras ready.Tabloids (小报) publish thrilling stories about their personal lives.Just imagine not being able to do anything without being photographed or interrupted for a signature!
According to pyschologist Christina Villarreal, celebrities—famous people—worry constantly about their public appearance.Eventually, they start to lose track of who they really are, seeing themselves the way their fans imagine them, not as the people they were before everyone knew their names.“Over time，” Villarreal says, “they feel separated and alone.”
The phenomenon of tracking celebrities has been around for ages.In the 4th century B．C., painters followed Alexander the Great into battle, hoping to picture his victories for his admirers.When Charles Dickens visited America in the 19th century, his sold－out readings attracted thousands of fans, leading him to complain (抱怨) about his lack of privacy.Tabloids of the 1920s and 1930s ran articles about film－stars in much the same way that modern tabloids and websites do.
Being a public figure today, however, is a lot more difficult than it used to be.Superstars cannot move about without worrying about photographers with modern cameras.When they say something silly or do something ridiculous, there is always the Internet to spread the news in minutes and keep their “story” alive forever.
If fame is so troublesome, why aren't all celebrities running away from it? The answer is there are still ways to deal with it.Some stars stay calm by surrounding themselves with trusted friends and family or by escaping to remote places away from big cities.They focus not on how famous they are but on what they love to do or whatever made them famous in the first place.
Sometimes a few celebrities can get a little justice.Still, even stars who enjoy full justice often complain about how hard their lives are.They are tired of being famous already.It can be learned from the passage that stars today________.
| A．are often misunderstood by the public |
| B．can no longer have their privacy protected |
| C．spend too much on their public appearance |
| D．care little about how they have come into fame |
What is the main idea of Paragraph 3?
| A．Great heroes of the past were generally admired. |
| B．The problem faced by celebrities has a long history. |
| C．Well－known actors are usually targets of tabloids. |
| D．Works of popular writers often have a lot of readers. |
What makes it much harder to be a celebrity today?
| A．Availability of modern media. |
| B．Inadequate social recognition. |
| C．Lack of favorable chances. |
| D．Huge population of fans. |
What is the author's attitude toward modern celebrity?
| A．Sincere. | B．Sceptical. |
| C．Disapproving. | D．Sympathetic. |
Mothers and daughters go through so much—yet when was the last time a mother and daughter sat down to write a book together about it all? Perri Klass and her mother, Sheila Solomon Klass, both gifted professional writers, prove to be ideal co－writers as they examine their decades of motherhood, daughterhood, and the wonderful ways their lives have overlapped(重叠)．
Perri notes with amazement how closely her own life has mirrored her mother's: both have full－time careers; both have published books, articles, and stories; each has three children; they both love to read.They also love to travel—in fact, they often take trips together.But in truth, the harder they look at their lives, the more they acknowledge their big differences in circumstance and basic nature.
A child of the Depression(大萧条), Sheila was raised in Brooklyn by parents who considered education a luxury for girls.Starting with her college education, she has fought for everything she's ever accomplished.Perri, on the other hand, grew up privileged in the New Jersey suburbs of the 1960s and 1970s.For Sheila, wasting time or money is a crime, and luxury is unthinkable while Perri enjoys the occasional small luxury, but has not been successful at trying to persuade her mother into enjoying even the tiniest thing she likes.
Each writing in her own unmistakable voice, Perri and Sheila take turns exploring the joys and pains, the love and bitterness, the minor troubles and lasting respect that have always bonded them together.Sheila describes the adventure of giving birth to Perri in a tiny town in Trinidad where her husband was doing research fieldwork.Perri admits that she can't sort out all the mess in the households, even though she knows it drives her mother crazy.Together they compare thoughts on bringing up children and working, admit long－hidden sorrows, and enjoy precious memories.
Looking deep into the lives they have lived separately and together, Perri and Sheila tell their mother－daughter story with honesty, humor, enthusiasm, and admiration for each other.A written account in two voices，Every Mother Is a Daughter is a duet(二重奏) that produces a deep, strong sound with the experiences that all mothers and daughters will recognize.Why does Perri think that her own life has mirrored her mother's?
| A．They both have gone through difficult times. |
| B．They have strong emotional ties with each other. |
| C．They have the same joys and pains, and love and bitterness. |
| D．They both have experiences as daughter, mother and writer. |
The word “luxury” in Paragraph 3 means________.
| A．something rare but not pleasant |
| B．something that cannot be imagined |
| C．something expensive but not necessary |
| D．something that can only be enjoyed by boys |
What is Paragraph 4 mainly about?
| A．The content of the book. |
| B．The purpose of the book. |
| C．The influence of the book. |
| D．The writing style of the book. |
How are women's lives explored in this book?
| A．In a musical form. |
| B．Through field research. |
| C．With unique writing skills. |
| D．From different points of view. |
Pop stars today enjoy what once only belonged to the royalty(皇室)．Wherever they go，people turn out in their thousands to greet them.The crowds go wild trying to catch a brief glimpse of their smiling，colorfully dressed idols.The stars are transported in their chauffeur driven Rolls Royces，private helicopters or executive aeroplanes.They are surrounded by a permanent entourage(随从)of managers，press agents and bodyguards.Photographs of them appear regularly in the press and all their comings and goings are reported，for，like royalty，pop stars are news.If they enjoy many of the privileges of royalty，they certainly share many of the inconveniences as well.It is dangerous for them to make unscheduled appearances in public.They must be constantly shielded from the adoring crowds who idolize them.They are no longer private individuals，but public property.The financial rewards they receive for this sacrifice cannot be calculated，for their rates of pay are great.
And why not？Society has always rewarded its top entertainers lavishly.The great days of Hollywood have become legendary：famous stars enjoyed fame，wealth and adulation(奉承)on an all time scale.By today's standards，the excesses of Hollywood do not seem quite so spectacular.A single gramopphone record nowadays may earn much more in royalties than the films of the past ever did.The competition for the title“Top of the Pops”is fierce，but the rewards are truly huge.
It is only right that the stars should be paid in this way.Don't the top men in industry earn enormous salaries for the service they perform to their companies and their countries？Pop stars earn vast sums in foreign currency—often more than large industrial companies—and the taxman can only be grateful for their massive annual contributions to the exchequer(国库)．So who would begrudge them their rewards?
It's all very well for people in boring jobs to complain about the successes and rewards of others.People who make envious remarks should remember that the most famous stars represent only the tip of the iceberg.For every famous star，there are hundreds of others struggling to earn a living.A man working in a steady job and looking forward to a pension at the end of it has no right to expect very high rewards.He has chosen security and peace of mind，so there will always be a limit to what he can earn.But a map who attempts to become a star is taking enormous risks.He knows at the outset that only a handful of competitors ever get to the very top.He knows that years of concentrated effort may be rewarded with complete failure.But he knows，too，that the rewards for success are very high indeed：they are the payback for the huge risks involved and once he makes it，he will certainly earn them.That's the essence of private enterprise.The author develops the passage mainly by ________.
| A．comparing different ideas |
| B．giving explanations |
| C．inferring |
| D．listing typical examples |
The underlined word “begrudge” in the third pararaph is closest in meaning to ________.
| A．be jealous of | B．be satisfied with |
| C．be anxious about | D．be crazy about |
According to the passage，which of the following can match the view of the author?
| A．He who laughs last laughs best. |
| B．If you venture nothing，you will gain nothing. |
| C．He who makes no mistakes makes nothing. |
| D．Success belongs to the persevering. |
Which of the following is true according to the passage?
| A．People are blind in idolizing stars. |
| B．There is fierce competition in becoming pop stars. |
| C．The government taxes pop stars very little. |
| D．Pop stars' life is more luxurious than that of royalty. |