Every electronic gadget (小玩意) needs good memory. A music player stores songs, al
题型：不详难度：来源：
Now, scientists in California say they have come up with a way to turn a living cell into a memory device.
It can store only one tiny bit of information, but it’s a start. In the future, a cell-based gadget might travel through the body and record measurements. The benefit to human health could be big: the right tool, for example, might record the earliest signs of disease.
Doctors, scientists and other curious people want to know what is happening inside the body, even at levels that can’t be seen by the naked eye. So far, there is no device small enough to travel through the bloodstream.
If normal machines won’t do the trick, perhaps biology will. Scientists who work in the field of synthetic (合成的) biology are trying to find ways to turn living things into human tools. In the case of the new memory device, bioengineers from Stanford University used the genetic material inside living cells to record information.
This genetic material consists of DNA. Found in nearly every cell, DNA carries all of the information that keeps a living thing alive.
In the new experiment, the researchers turned DNA from bacteria(细菌) into a switch. They “flip (翻转)” a small section of DNA. Then, using the same procedure (过程) , the scientists flip the section again—returning it into its normal structure.
Using these DNA switches, “We can write and erase DNA in a living cell,” bioengineer, Jerome Bonnet, explained to Science News.
It might take years before his team or others identity whether a DNA-based memory device might be practical. Right now, it takes one hour to complete a flip. That is far too long to be useful. Plus, a flipped section has a very small little memory—less than what a computer uses to remember a single letter.
“This was an important proof that it was doable,” Bonnet told Science News. “Now we want to build a more complex system, something that other people can use.”
小题1:What is the aim of listing the electronic things in the first paragraph?
| A．To make the passage more fashionable. |
| B．To show how electronic things have memory. |
| C．To discuss things in detail. |
| D．To make the subject of the text more understandable. |
| A．To detect disease at the earliest point. |
| B．To help improve the memory. |
| C．To help people build a body. |
| D．To replace many electronic gadgets. |
A. The cells of bacteria.
B. The DNA of bacteria.
C. A section of bacteria.
C. The nucleus of bacteria.
小题4:What do we know about a flipped section of DNA?
| A．It has a very small memory. |
| B．It can function as a computer. |
| C．It has one letter in it. |
| D．It takes a day to complete it. |
答案
小题1:D
小题2:A
小题3:B
小题4:A
解析
试题分析：本文主要介绍了科学家已经成功把活细胞植入了记忆装置以及现在科学家正在研究细菌的DNA。
小题1:推断题。第一自然段列举电子事物的目的是使得这篇文章的主题更容易理解，故选D。
小题2: 细节题。根据It can store only one tiny bit of information, but it’s a start. In the future, a cell-based gadget might travel through the body and record measurements. The benefit to human health could be big: the right tool, for example, might record the earliest signs of disease.可知它的好处在于可以早期发现疾病，故选A。
小题3:细节题。根据In the new experiment, the researchers turned DNA from bacteria(细菌) into a switch. They “flip (翻转)” a small section of DNA. Then, using the same procedure (过程) , the scientists flip the section again—returning it into its normal structure.可知正在被研究的物体是细菌的DNA，故选B。
小题4: 细节题。根据That is far too long to be useful. Plus, a flipped section has a very small little memory—less than what a computer uses to remember a single letter.故选A。
举一反三
There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shades of green. Sometimes a person can’t tell the differences between blue and green. In rare cases an unlucky man sees everything in shades of green--- a strange world in deed.
Color blindness in human beings is a strange thing to explain. In a single eye there are millions very small things called “cones”. These help us see in a bright day and tell the differences between colors. There are also millions of “rods”, but these are used for seeing when it is nearly dark. They show us shapes(形状) but not color. Some insects have favorite colors. Mosquitoes like blue but do not like yellow. A red light will not attract insects but a blue lamp will. In similar way human being also have favorite colors. Yet we are lucky. With the aid of cones in our eyes we can see many beautiful colors by day and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.
小题1:The passage is mainly about ______.
| A．color and its surprising effects on drivers |
| B．women being luckier than man in that fewer of them are color blind |
| C．danger caused by color blindness |
| D．color blindness and how our eyes tell different colors and shapes |
| A．tell different colors | B．see in weak light |
| C．tell different shapes | D．tell orange from yellow |
| A．Women are more careful. |
| B．There are fewer color blind women. |
| C．Women are fonder of driving than men. |
| D．Women are weaker but quicker in thinking. |
| A．Not all of them have the same problem in recognizing colors. |
| B．None of them can see deep red but all can tell blue from green. |
| C．None of them can tell blue from green but all can see deep red. |
| D．All of them are lucky enough to see everything in shades of green. |
● To save time and money, use the college’s bus system. Taking the bus to school is quick, easy and free in most college towns. You won’t have to locate or afford a place to park either. It’s also a good way to be environmentally aware.
● Save pennies on books by waiting until class starts. You might not even need all of the recommended books. New textbooks cost an arm and a leg. Try buying used textbooks — it’s a surefire way to save money and serves the purpose as well.
● Do never look at college life as an endless series of parties and social activities. But there is a whole lot more to college if you’re serious about graduating. Having a good college experience is all about balancing work and fun.
● Be aware that your living environment can largely affect your academic success. If the dorm doesn’t suit you, consider living at home with your family or renting your own apartment. The best location for your studies isn’t always your dorm. Find a quiet area, like the library, to do your work. Alternatively, buy some headphones that block out noise.
● Be mindful of your diet. Make healthy food choices and watch what you eat. Avoid foods that are processed or high in sugar. The “freshman 15” is real. Many college students gain at least 15 pounds during their freshmen year.
● While electives (选修课) can be helpful when figuring out your major, you shouldn’t entirely rely on them. Clubs and other organizations exist around. Get involved. Make sure, though, that you still have time to study. Having too much on your plate can hurt your grades.
小题1:Which of the following ideas can be financially wise?
| A．Driving your own car. | B．Buying used books. |
| C．Renting an apartment. | D．Attending activities. |
| A．academic failures | B．physical problems |
| C．traffic accidents | D．social activities |
| A．attend limited activities on campus |
| B．have little regular physical exercise |
| C．focus less on their academic work |
| D．take relaxed attitudes to their diets |
| A．using too much money for meals |
| B．eating too many unhealthy foods |
| C．taking part in too many after-class activities |
| D．taking an elective that has too many students |
Scientists played a selection of music to a group of South American cotton-top monkeys but the only sound that got a reaction were from the heavy metal band Metallica. They were seemingly disinterested in Led Zeppelin, Miles Davis and Bach, but after the beautiful sound of Master of Puppets by Metallica was played the monkeys calmed down.
"Monkeys interpret rising and falling sounds differently than humans. Oddly, their only response to several samples of human music was a calming response to the heavy-metal band Metallica," said Professor Charles Snowdon, from the University of Wisconsin-Madison.
Rather than making them excited or aggressive, the heavy metal tracks had a comforting effect. Dr Snowdon, who teamed up with National Symphony Orchestra musican David Teie, also played the monkeys music composed specifically for them. Although they enjoyed Metallica, they were much more interested in these pieces.
A melody(乐曲) based on the short calls of scared monkeys led to anxiety levels rapidly growing, researchers found, while one based on long calls the creatures make when they are happy had a calming effect.
Frans B.M. de Waal, a professor of psychology at Emory University who studies animals, said the findings appear to say more about how monkeys respond to the sounds they make than they do about music or the evolution of music.
Dr Snowdon no longer has a monkey colony to use in his research, but he said his co-author David Teie is exploring the concept of music for cats.
"If we understand how we can affect their emotional states through using musical sound and aspects of our speech, maybe those of us living with companion animals can have a better relationship with them, too," Snowdon said.
小题1:The research mentioned in the passage is mainly about ______.
| A．the change of music over time | B．animals’ response to music |
| C．special music for animals | D．the origin of music |
| A．looked anxious | B．became restless |
| C．felt at ease | D．made long calls |
| A．of Led Zeppelin | B．of Miles Davis |
| C．of Metallica | D．specially composed for them |
| A．build better ties between animals and humans |
| B．compare monkeys and cats in term of music |
| C．develop new music based on animals’ calls |
| D．find better ways to keep animals under control |
This made me start questioning myself and what I had been raised to believe. I was raised to believe that a quiet, calm child was a sure way to success. This child would have the willpower to study hard, get good grades and become someone important in life.
Now those same people perhaps come to realize that their kids are born with their own sets of DNA and personality qualities, and all you can do is loving and accepting them. As parents, throughout their growing years and beyond that, we need to be our kids’ best cheerleaders, guiding them and helping them find their way.
I have stopped asking my son to sit down and concentrate. Obviously, he is concentrating just in his own way and not mine. We need to learn to accept our kids’ ways of doing things. Some way may have worked for me but doesn’t mean we need to carry it through generations. There is nothing sweeter than being personal and unique (独特的). It makes us free and happy and that’s just the way I want my kids to live their own life.
小题1:Time and again the author got his son seated in order to make him ______.
| A．work fast | B．go polite | C．stay relaxed | D．keep attentive |
| A．his son’s doing better while standing up |
| B．his failure in keeping his son under control |
| C．his own experience as a school boy |
| D．his disappointment with his active child |
| A．correct their kids’ manners from the early ages |
| B．respect and trust their kids’ ways of behaviors |
| C．develop a good relationship with their children |
| D．guarantee their children’s freedom at home |
| A．Parental help with teens’ study |
| B．Adult influence on teen growth |
| C．Kids’ success in their own styles |
| D．Friendship between generations |
Having just quit a highly moneymaking job with tech giant Microsoft in the United States，where he’d made millions working as a program manager，Patrick Awuah would wake up once in a while wondering if he’d done the right thing．
What Awuah wanted was to create a university in his native Ghana．a state-of-the-art education centre that would help educate the country’s next generation of leaders．Awuah moved with his family back to Ghana．There，he invested his own money and with the help of other donors he founded Ashesi University．
“Africa needs to have a renaissance(复兴),” says Awuah as he explained what drove him to take the risky decision．“The world needs to change in this way and I strongly believe that people like me need to be part of the solution；I need to be really actively involved in helping to drive this change in Africa‘‘
Located about an hour"s drive from the capital Accra，Ashesi，which appropriately translates to “beginning,” is the first Ghanaian university to combine technical majors with a liberal arts approach．Its campus，set on 100 acres in a town called Berekuso，was designed to be inspiring for the more than 500 young Ghanaians studying there．
“So when I look at universities I see Africa fast—forward 30 years．When this 20-year-old is now in his or her 50s，that person is going to be a leader．”
Today Ashesi，which celebrates its 10th anniversary this year，offers degrees in business，information systems and computer science．There are plans to offer engineering and economics majors in the near future．The school’s graduation rate is between 70％and 90％，according to Awuah．
In our last freshman class，50％ of the students paid full tuition(学费)，25％were on full scholarships and 25％on partial scholarships ,”he said．“The reason why variety is so important is that the most important conversation on campus is a conversation about the good society—what is the good society we would like to see in Africa? That conversation is a lot more interesting if you have variety in the classroom，”adds Awuah．
小题1:In Awuah’s opinion，Africa should be changed by
| A．investing more money for development |
| B．developing computer science |
| C．training future leaders for development |
| D．founding more universities |
| A．Awuah regretted that he had once worked with Microsoft |
| B．Awuah would doubt if he should resign from Microsoft |
| C．Awuah wondered whether it was right to invest for a university |
| D．Awuah felt it wrong that he had refused a job with a large salary |
| A．came into being 10 years ago | B．was named with “beginning” |
| C．is located in the capital of Ghan | D．will be run for 30 years |
| A．Ashesi has offered five degrees since it was founded． |
| B．Awuah had earned millions of dollars before he left Microsoft． |
| C．50％ of the new students in Ashesi receive education for free． |
| D．Awuah was the only investor in setting up Ashesi University． |
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