Back in old times, people had little knowledge about the universe and nature. Things we now consider to be common sense were mysteries to our ancestors.
Over the years, major breakthroughs have been made in science and many phenomena have been explained. But still, there are always questions we can't yet answer, and The Guardian has listed some of them.
1. What makes us human?
Just looking at your DNA won't tell you - human DNA is 99 percent identical to that of the chimpanzee and, believe it or not, 50 percent identical to a banana's! A lot of the things we once thought were unique about us - language and tool use, recognizing ourselves in the mirror and so on – have since been seen in other animals. Perhaps it's our culture that makes the difference or maybe our ability to use fire. It's also possible that our capacity (能力) for co-operation and our trading skills are what make us unique.
2. Why do we dream?
Given the fact that we spend around a third of our lives sleeping, shouldn't we know everything about it? Unfortunately, scientists are still searching for a complete explanation of what happens when we sleep and why we dream.
Austrian psychologist Sigmund Freud believed dreams were the expressions of wishes that we can't fulfill in our real lives. Others have wondered whether dreams are just random "noise" coming from a sleeping brain.
3. Could we someday live forever?
Apart from accidents, most people die because of diseases that can be treated and aging. And since many diseases, such as diabetes（糖尿病） and cancer, are diseases of aging, treating aging itself could be the key to extending our lives.
Our knowledge of what causes us to age - and what allows some animals to live longer than others - is expanding rapidly. And though we haven't quite worked out all the details, we've worked out some pieces of the puzzles such as DNA damage and metabolism (新陈代谢), which are all leading to the invention of drugs that can slow down the aging process.
If we're lucky enough to lengthen our lives, we might even get to see the day when all of these questions are answered.The main point of the passage is ______.
| A．to inform people of the knowledge about the universe and nature |
| B．to introduce major breakthroughs that have been made in science |
| C．to present some questions we can't yet answer |
| D．to explain what were once mysteries to our ancestors |
Chimpanzees and bananas are mentioned as examples to prove that ______.
| A．human beings are actually not different from other animals |
| B．animals have completely different DNA from that of plants |
| C．both animals and plants share the same amount of DNA |
| D．DNA alone is not good enough to make humans different |
The underlined word "identical" is closest in meaning to ______.
| A．mysterious | B．unique | C．advanced | D．same |
Which of the following statements is TRUE according to the passage?
| A．What were mysteries to our ancestors are considered to be common sense now. |
| B．Now we know much more about dreams than our ancestors did in the past. |
| C．With the invention of new drugs people can possibly live even longer. |
| D．If all the diseases can be treated people can theoretically live forever. |
“OK,” I said to my daughter as she bent over her afternoon bowl of rice. “What’s going on with you and your friend J.? ” J. is the leader of a group of third-graders at her camp—a position Lucy herself occupied the previous summer. Now she’s the one on the outs. and every day at snack time, she tells me all about it, while I offer the unhelpful advice all summer long.
“She’s fond of giving orders, “Lucy complained. “She’s turning everyone against me. She’s mean. And she’s fat.” “Excuse me,” I said, struggling for calm. “What did you just say?” “She’s fat.” Lucy mumbled (含糊地说). “We’re going upstairs,” I said, my voice cold. “We’re going to discuss this.” And up we went. I’d spent the nine years since her birth getting ready for this day, the day we’d have the conversation about this horrible word. I knew exactly what to say to the girl on the receiving end of the teasing, but in all of my imaginings, it never once occurred to me that my daughter would be the one who used the F word—Fat.
My daughter sat on her bed, and I sat beside her. “How would you feel if someone made fun of you for something that wasn’t your fault?” I began. “She could stop eating so much,” Lucy mumbled, mouthing the simple advice a thousand doctors have given overweight women for years.
“It’s not always that easy,” I said. “Everyone’s different in terms of how they treat food.” Lucy looked at me, waiting for me to go on. I opened my mouth, then closed it. Should I tell her that, in teasing a woman’s weight, she’s joined the long tradition of critics? Should I tell her I didn’t cry when someone posted my picture and commented, “I’m sorry, but aren’t authors who write books marketed to young women supposed to be pretty?”
Does she need to know, now, that life isn’t fair? I feel her eyes on me, waiting for an answer I don’t have. Words are my tools. Stories are my job. It’s possible she’ll remember what I say forever, and I have no idea what to say.
So I tell her the only thing I can come up with that is absolutely true. I say to my daughter, “I love you, and there is nothing you could ever do to make me not love you. But I’m disappointed in you right now. There are plenty of reasons for not liking someone. What she looks like isn’t one of them.”
Lucy nods, tears on her cheeks. “I won’t say that again,” she tells me, and I pull her close, pressing my nose against her hair. As we sit there together, I pray for her to be smart and strong. I pray for her to find friends, work she loves, a partner who loves her. And still, always, I pray that she will never struggle as I’ve struggled, that weight will never be her cross to bear. She may not be able to use the word in our home, but I can use in my head. I pray that she will never get fat.Why does the author want to discuss with Lucy?
| A．Because she wants to offer some other helpful advice. |
| B．Because she is really shocked at Lucy’s rudeness. |
| C．Because she has prepared the conversation for nine years. |
| D．Because she decides to tell Lucy a similar story of her own. |
What does the author want to tell her daughter?
| A．It is not easy to take the doctors’ advice to eat less. |
| B．People shouldn’t complain because life is unfair. |
| C．People shouldn’t be blamed for their appearance. |
| D．She herself was once laughed at for her appearance. |
It can be inferred from the passage that_______.
| A．the author earns a living by writing stories. |
| B．the author is a fat but good-looking woman. |
| C．the author will stop loving her daughter for what she said. |
| D．the author’s daughter agreed with her from the very beginning. |
The author’s attitude towards her daughter can be best described as _______.
| A．satisfied and friendly | B．indifferent but patient |
| C．loving but strict | D．unsatisfied and angry |
Death is natural, but do you have any idea of the process of dying? Modern scientists divide the process of dying into two stages---clinical or temporary death and biological death. Clinical death occurs when the vital organs, such as the heart or lungs, have ceased to function, but have not suffered permanent damage. The organism can still be revived(复活). Biological death occurs when changes in the organism lead to the “breaking up” of vital cells and tissues. Death is then unchangeable and final.
Scientists have been seeking a way to lengthen the period of clinical death so that the organism can remain alive before biological death occurs. The best method developed so far involves cooling of the organism, combined with narcotic（麻醉的) sleep. By slowing down the body’s metabolism(新陈代谢), cooling delays the processes leading to biological death.
To illustrate how this works, scientists performed an experiment on a six-year-old female monkey called Keta. The scientist put Keta to sleep with a narcotic. Then they surrounded her body with ice-bags and began checking her body temperature. When it had dropped to 28 degrees the scientists began draining（流光466） blood from an artery（动脉）. The monkey’s blood pressure decreased and an hour later both the heart and breathing stopped: clinical death set in. For twenty minutes Keta remained in this state. Her temperature dropped to 22 degrees. At this point the scientists pumped blood into an artery in the direction of the heart and started artificial breathing. After two minutes Keta’s heart became active once more. After fifteen minutes, spontaneous(自发的)breathing began, and after four hours Keta opened her eyes and lifted her head. After six hours, when the scientists tried to give her a penicillin injection, Keta seized the syringe（注射器）and ran with it around the room. Her behavior differed little from that of a healthy animal.For a person who suffers from the clinical death ___________.
| A．he still has the possibility of getting back to life |
| B．his most important organs are damaged. |
| C．he can not avoid final death. |
| D．he is still very much alive |
Scientists try to make the time of clinical death longer in order to___________.
| A．slow down the body’s metabolism. |
| B．bring vital cells and tissues back to active life. |
| C．delay the coming of biological death. |
| D．cool the organism. |
How did the scientists put Keta into clinical death?
| A．By surrounding her body with ice-bags and draining her blood. |
| B．By lowing her blood pressure and stopping her heart from beating. |
| C．By draining her blood, lowering her blood pressure and stopping her breathing. |
| D．By putting her to sleep, lowering her temperature and draining her blood. |
All of the following indicate that the monkey has almost restored to her original physical state except the fact that___________.
| A．her heart beat again. |
| B．she regained her normal breath. |
| C．she rejected a penicillin injection. |
| D．she acted as lively as a healthy monkey. |
A store that sells husbands has just opened in Ottawa where a woman may go to choose a husband from many men.
The store consisted of 6 floors and the men increase in positive attributes（品质，特点）as the shopper goes up the flights. There is, however, a catch（陷阱）. As you open the door to any floor you may choose a man from that floor, but if you go up a floor, you cannot go back down except to exit the building.
So a woman goes to the shopping center to find a husband. On the first floor the sign on the door reads: Floor 1— These men have jobs. The woman reads the sign and says to herself, “Well, that’s better than my last boyfriend, but I wonder what’s further up?”
So up she goes. The second floor sign reads: Floor 2 — These men have jobs and love kids. The woman remarks to herself, “That’s great, but I wonder what’s further up?”
And up she goes again. The third floor sign reads: Floor 3 — These men have jobs, love kids and are extremely good-looking. “Hmm, better.”
The fourth floor sign reads: Floor 4 — These men have jobs, love kids, are extremely good-looking and help with the housework. “Wow!” exclaims the woman, “Very tempting. But, there must be more, further up!”
And again she heads up another flight. The fifth floor sign reads: Floor 5 —These men have jobs, love kids, are extremely good-looking, help with the housework and have a strong romantic character. “ Oh, mercy me! But just think…what must be awaiting me further on?”
So up to the sixth floor she goes. The sixth floor sign reads: Floor 6 –You are visitor 3, 456, 789,012 to this floor. There are no men on this floor. Thank you for shopping Husband Mart and have a nice day.Women tend to go up the floor until they reach the top floor because _____.
| A．they think the husbands downstairs are not suitable |
| B．they are sure that the best husbands are on the top floor |
| C．they think even better husbands may be upstairs |
| D．they know the catch very well |
The writer intends us to believe that _____.
| A．husbands are hard to shop |
| B．women are hard to please |
| C．women think they are better than men |
| D．women can’t be too careful when choosing husbands |
We can infer from the passage that _____.
| A．women are not good at shopping husbands |
| B．more women will leave the shop alone |
| C．women are romantic |
| D．women are more kind than men |
While some scientists overlook the existence of a sixth sense for danger, a new research from Washington University in St. Louis has discovered a brain area that clearly acts as an early warning system and helps us adjust our behavior to avoid dangerous situations.
"Our brains are better at picking up not obvious warning signs than we previously thought," said Joshua Brown, a PhD in psychology in the issue of the journal Science.
The findings offer exact scientific evidence for a new way to form a concept of the complex control processes taking place in and around the ACC, a brain area located near the top of the frontal lobes(耳垂) and along the walls that divide the left and right hemispheres(大脑半球).
"In the past, we found activity in the ACC when people had to make a difficult decision, or after they make a mistake," Brown said. "But now we find that this brain area can actually learn to recognize when you might make a mistake, even before a difficult decision has to be made. So the ACC appears to act as an early warning system—— it learns to warn us in advance when our behavior might lead to a negative outcome, so that we can be more careful and avoid making a mistake."
By providing a clearer picture by which we self monitor and control our behavior, the study is an important step in efforts to develop more effective treatments for mental illnesses. It also provides a new way of understanding inappropriate behaviors that often accompany mental illnesses.
"Our results suggest how injury of the ACC can lead to breakdowns in the early warning system, so that the brain fails to stop or control inappropriate behavior ahead of time," said Brown. "On the other hand, in those persons with mental disorder, the ACC might warn us of an upcoming problem even when no problem is in the existence."
Known to be an important part of the brain's control system, the ACC is believed to help adjust between cold, hard, fact-based reasoning and emotional responses, such as love, fear or expectation.According to the passage, the ACC____________.
| A．refers to the sixth sense for danger |
| B．deals with obvious warning situations |
| C．connects the left and right hemispheres |
| D．sends warning messages in advance |
The new research is beneficial because it ________ .
| A．provides a new way of avoiding mistakes |
| B．adjusts emotional responses in time of danger |
| C．helps find better treatments for mental illnesses |
| D．assists people in predicting and avoiding danger |
The new research helps us understand _________.
| A．why we are likely to make mistakes when the ACC is badly injured |
| B．why people with illnesses usually have so many strange behaviors |
| C．how the ACC works when something dangerous happens |
| D．how our brain warns us of failure in advance |
Singles' Day ---- the Chinese opposite of Valentine’s Day has turned into a massive online shopping event. It is a day when single people are supposed to buy themselves presents. But there are sociological reasons behind China's “celebration” of single life. And the imbalance could have big consequences for the country.
There were 34 million more men than women in China in 2011. Part of that is natural – usually there are 105 boys born for every 100 girls. But the Chinese gender ratio (性别比例) at birth is much more obvious. It was 116 boys to 100 girls in 2012. The one child policy is largely to blame. Brought in to limit population expansion, the policy allows only one child per family. But because male children are seen as more valuable, as well as more likely to support their parents in old age, some parents choose to have a son over a daughter. The result is that large numbers of men will likely never get married. In fact, one study has predicted that by 2030, 1 in 5 Chinese men in their 30s will never have married, while another states that 94% of unmarried people in China are men.
Traditionally, China has seen high levels of marriage, usually among the young. Besides, the increased education and career opportunities for women have meant that marriages are happening later. It is also traditional that women often marry men of a higher socioeconomic status than themselves. So women at the top and men at the bottom find themselves alone. One study has even suggested a link between an imbalanced gender ratio and growth in violent crime in the country.
Singles’ Day can’t solve all the problems China’s singles face. Indeed, it is possible that it is causing even more problems, as men resort to increasingly risky lines of work to increase their chances of gaining money and thus a wife. I am worried that as money starts to overcome romance, there is evidence that China ' s marriage market is increasingly materialistic.In 2012, if 50 girls were born, how many boys were probably born?
| A．50. | B．52. | C．58. | D．60. |
What made women in China get married late?
| A．Their support of the government’s late marriage policy. |
| B．Their higher education level and more work chances. |
| C．That they expect to enjoy their single time when young. |
| D．That there are too many excellent young men to choose from. |
What’s the writer’s attitude to the imbalance gender ratio in China?
| A．Optimistic | B．Concerned |
| C．Indifferent | D．Unknown |
We can learn from the passage that .
| A．Singles' Day is celebrated all over the world. |
| B．by 2030, 1 in 5 Chinese women in their 30s will be out of marriage. |
| C．an imbalanced gender ratio is related to the growth in violent crime. |
| D．Singles' Day will solve all the problems China’s singles face. |