题干

   Government intelligence agencies have a plan to build computers that store information inside DNA and other organic molecules(分子).

Intelligence Advanced Research Projects Activity(IARPA)announced plans to develop tabletop-sized machines that can store and retrieve(取回)data from large batches of polymers — a term that refers to a wide variety of long,string-like molecules. Polymers can store data in individual atoms or groups of atoms.

The project is an attempt to solve a basic problem of the modern era:the vast and growing costs of data storage. Datacenters around the world sucked up 416. 2 terawatt hours of electricity in 2016. That's about 3 percent of the global supply,and it accounts for 2 percent of global greenhouse gas emissions.

A 2016 paper found that DNA,in particular,could store computer information more densely,require less energy,and survive higher and lower temperatures than conventional hard drives. The authors of that paper reported on the successes of prototype(雏形)DNA computers that used the genetic molecules for both long-term storage and random access memory(RAM).

But no one has yet figured out how to handle DNA data storage on large scales.

IARPA officials said the new effort, called Molecular Information Storage, will be broken up into three periods:a two-year program to figure out how to store data in DNA or other molecules at high speed,a two-year program to figure out how to retrieve that data at high speed, and a two-year effort to develop an operating system that can run on that DNA.

Many of the technologies IARPA wants to develop are untested at these scales, so it's unclear how far away that proposed tabletop device really is.

【小题1】What would be the best title for the text?
A.Store Data on DNA Computers
B.Develop Computers of Future
C.Polymers Used to Store Data
D.Information Stored in DNA
【小题2】Which of the following best explains“sucked up”underlined in Paragraph 3?
A.Consumed.B.Stored.
C.Delivered.D.Produced.
【小题3】What can Molecular Information Storage do compared to traditional hard drives?
A.Produce and save less energy.
B.Store more information faster.
C.Be better for the environment.
D.Control temperatures more easily.
【小题4】Where can you find the course of the test about Molecular Information Storage?
A.In Paragraph 3.B.In Paragraph 4.
C.In Paragraph6.D.In Paragraph 7.
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同类题1

   A new tool of communication called the "drift diary" is doing the rounds among young college graduates.

The "drift diary", like those ancient paper messages put into a bottle left to drift on the high seas to reach hundreds of miles away, connects lonely hearts. It was first started by a Beijing woman, who goes by the screen name Little S, in 2007.It has become the preferred tool of communication among youngsters afraid to reveal their innermost self to peers, but wanting to share their lives with others. The way it works is that the initiator(发起人)of the diary mentions it on popular Internet forums such as Tianya and Douban. Those wanting to react or otherwise add to the diary then send their real names and addresses to the initiator via e-mails or text messages.

The numbers in one group are usually restricted to between 30 and 50. The diary then is passed on to another by the express delivery or personal handover. The diary writers are mostly anonymous(匿名的)but if they wish to reveal their identity they can do so by posting their contact information at the end of their postings.

The diary writers not just add words but also decorate the plain notebooks with cartoons, drawings or even dress it up with a ribbon or a new cover. Interesting experiences, travel journals, the simple joys of everyday living or sweet recollections of childhood, all find a place in these diaries. Most often, though, the writers set down their frustrations and predicaments.

It usually takes one year for a diary to return to the initiator. The last recorder is the luckiest one, with access to all previous entries, while others can request photocopies of them from the diary's initiator.

【小题1】Why is the "drift diary" popular among youngsters?
A.Because they hate using the Internet.
B.Because they like to show themselves to peers.
C.Because they want to share their lives with strangers.
D.Because they find it fashionable to be a diary writer.
【小题2】Which one shows the correct way a drift diary works?
①The diary then is passed on between the recorders.
②The diary returns to the initiator.
③The initiator of the diary makes a mention online.
④Participants request photocopies of the diary from the diary's initiator.
⑤Those who want to participate in the program get in touch with the initiator.
A.③⑤①④②B.③⑤①②④
C.④⑤①②③D.①③⑤②④.
【小题3】What does the underlined word "predicaments" in the last but one paragraph probably mean?
A.Successful experiences.B.Sense of achievement.
C.Difficult situations.D.Favorable conditions.
【小题4】Which of the following can be used as the best title for the passage?
A.Drift Diary——A New Tool of Communication
B.How a Drift Diary Works
C.Share Your Lives with Strangers
D.The Diary Passed on

同类题2

   Robyn Lee, a 15-year-old teenage girl who studies at York Community High School, US says she has four friends. But she also has 15 to 20 other friends she considers part of her regular social circle.

“It's like a bad thing to have only one, friend ,”explained Robyn. “If you have one friend, it means only one person likes you. That’s not cool,” she said.

For many years, experts studying teen friendships have known that teenagers prefer to travel in groups. In studies conducted in 1963 and in 1995, researchers found teen friendship groups averaged six people. In 2005, when teens were asked about how many friends they kept in touch with regularly, the average answer was 20.

The change to bigger -group friendships has advantages, such as increasing more connections and improving teens' self-pride by giving them a place to belong.

However, the change also has some disadvantages,say psychologists. “The meaning of friendship is becoming much more complicated,” said Bernardo Carducci, a professor of psychology at Indiana University Southeast.

MaryRose Moss, a 17-year-old in Chicago, knows how she could get more friends. She created a Facebook page when she was 14 and within months , she had her group of 500 friends.

Text messaging has opened the door to many new connections, she says. “I'm friends with some people that I wouldn't be as close to if it weren't for technology,” said Moss. “It's so easy to send a text to somebody even if you don't know him very well. ”

Some psychologists wonder whether social-networking technology is affecting some skills children once got from making friends in the old-fashioned way.

“In the past, you argued, discussed and reached an agreement, but if somebody disagrees with you now, you can ‘defriend’ him with the click of keys,” said Carducci.

Marianne Boe, a social studies teacher in Chicago , sees signs of changing friendships in the hallways. Ten years ago, she could easily know groups of girls who stayed friends through all four years of high school. “Today, it's harder,” Boe said.

【小题1】Robyn is introduced at the beginning _____________ .
A.to show how today's teenagers make friends
B.to give an example of modern teen friendship patterns
C.to show that today's teenagers are afraid of loneliness
D.to give an example of teen addiction to social networks
【小题2】What is behind the change to bigger-group friendships,according to the passage?
A.Text messaging.
B.Changes in teen taste.
C.Modern technology.
D.Social-networking culture.
【小题3】What can we learn from the last paragraph?
A.Teenagers don't know how to develop really close friendships.
B.Teenagers change their friends more often than before.
C.True friends no longer appear in the school hallways.
D.Teenagers respect others' privacy more than before.

同类题3

   Nowadays, I acknowledge that a revolution has occurred. That much has been ___ by having hand-held iPads or smart phones that allow us not only to communicate while on the _____ but also to reserve parking spaces, get weather reports, and _____ tell us where, at any given moment, we are standing on the planet Earth.

But I must acknowledge a _____. Conversation used to be surprisingly _____ to start. When I took a seat next to someone on a train, bus, or plane, the first thing I would do was _____ the person. Once the ice had been broken, the following chat _____ erupt naturally.

Time has changed, and the change has been _____. Recently, while I was _____ a long distance bus, I couldn't help but notice everyone was staring at their ______, clicking. I found an empty seat next to a middle-aged man and said "Morning" to him. He threw me a ______ and said "Morning". Then he returned to his ______. So I left him in his world.

I miss the ______ conversations with fellow travelers. One never knows what will be ______, and in fact, sometimes how ______ it will be. I was once on a ______ traveling from Iceland to Denmark. I noticed an old man looking out over the North Sea. "It's beautiful, isn't it?" I said. He turned to me,______, and we were soon chatting away. _____ I told him that I didn't know how I was going to get from the port in Denmark to my destination city. He ______,"Of course you know. I have a car and I'm going to ______ you there. "

【小题1】
A.abandonedB.deliveredC.gainedD.released
【小题2】
A.spotB.sceneC.runD.road
【小题3】
A.basicallyB.preciselyC.brieflyD.randomly
【小题4】
A.discoveryB.pleasureC.failureD.loss
【小题5】
A.difficultB.easyC.comfortableD.important
【小题6】
A.praiseB.greetC.watchD.respect
【小题7】
A.aimed toB.happened toC.tended toD.required to
【小题8】
A.strikingB.challengingC.touchingD.puzzling
【小题9】
A.leavingB.visitingC.expectingD.boarding
【小题10】
A.seatsB.baggageC.handsD.windows
【小题11】
A.cigaretteB.smileC.glanceD.gesture
【小题12】
A.bookB.newspaperC.musicD.cellphone
【小题13】
A.politeB.casualC.frequentD.cautious
【小题14】
A.exposedB.chosenC.doubtedD.preserved
【小题15】
A.helpfulB.typicalC.suitableD.convenient
【小题16】
A.shipB.trainC.planeD.bus
【小题17】
A.repliedB.rejectedC.hesitatedD.nodded
【小题18】
A.EventuallyB.ImmediatelyC.PurposelyD.Secretly
【小题19】
A.respondedB.recognizedC.explainedD.suggested
【小题20】
A.meetB.visitC.driveD.drop

同类题4

   The newspaper has been a part of our daily life for several centuries. It has been a way for the public to be informed of _____ events that are occurring around the world. Newspapers have _____ great changes over the course of history. Some of the _____ newspapers date back to Ancient Rome where important announcements (公告) were carved in stones and placed in highly populated areas, _____ in this way citizens could be informed of the announcements.

For centuries, many changes have _____ The biggest one was the use of the printing press. This change _____ the production of the newspaper, and the number of papers available to the public greatly increase    D. At the same time the change made it _____ for people to purchase one. These developments led to a (n) _____ in the newspaper industry where several different newspapers started to appear in big _____ , publishing morning, afternoon and evening editions. These papers ______ readers news, the weather and other features that informed and ______ them.

Over the course of time, however, newspaper costs continued to rise and the number of newspaper buyers continued to ______ This led to a vast reduction in the number of newspapers and newspaper editions at every market. ______ , with the increase in the use of ______ , the public no longer needed the newspaper for its source of ______ Other media such as radio, television and the Internet started to ______ the paper as an information source.

In recent years, newspapers and other media have ______ to the changing technology environment by starting to offer ______ editions to cater to (满足需要) the needs of the public. In the future, more ______ will be surely paid to the Internet, social media and other electronic methods. However, the newspaper and the industry ______ have a place in the world.

【小题1】
A.interestingB.importantC.strangeD.political
【小题2】
A.experiencedB.createdC.sufferedD.escaped
【小题3】
A.best-knownB.nicestC.earliestD.simplest
【小题4】
A.unlessB.sinceC.onceD.though
【小题5】
A.come byB.made upC.broken outD.taken place
【小题6】
A.sped upB.put upC.ended upD.took up
【小题7】
A.respectableB.fashionableC.agreeableD.affordable
【小题8】
A.silenceB.pauseC.boomD.arrival
【小题9】
A.citiesB.familiesC.villagesD.factories
【小题10】
A.providedB.offeredC.publishedD.advertised
【小题11】
A.describedB.satisfiedC.motivatedD.followed
【小题12】
A.failB.leaveC.formD.fall
【小题13】
A.After allB.For sureC.At lastD.In addition
【小题14】
A.technologiesB.computersC.televisionsD.telephones
【小题15】
A.knowledgeB.informationC.pleasureD.ability
【小题16】
A.copyB.matchC.replaceD.regard
【小题17】
A.adaptedB.adoptedC.opposedD.agreed
【小题18】
A.latestB.traditionalC.modernD.online
【小题19】
A.moneyB.attentionC.energyD.time
【小题20】
A.stillB.neitherC.againD.even

同类题5

Well, parents, surprise! Lots of us are using Twitter and Facebook to find rides, and not just to school. It’s awkward to call a friend and ask for a ride, and half the time they’ll say, “Sorry, my car is full.” But with Twitter, you just tweet (贴子,留言) and look for other people heading the same way.
It may sound risky, but many teens stay within their own social circles to find rides, and don’t branch out beyond friends of friends when asking on Twitter. For me, I only rideshare with people I know, but to some young people, especially those taking longer trips, stranger danger is less of a concern.
The sharing economy got big during the recession(经济衰退). It allows people to access more goods and services using technology, while also allowing them to share cost. And that technology, for me, is what the car was for my mom, a gateway to more freedom.
According to the researchers at the University of Michigan, 30 years ago, eight in ten American 18-year-olds had a driver’s license. Today it’s six in ten. So it’s not that surprising that on my 16thbirthday I wasn’t rushing to get a license. All I wanted was an iPhone. Juliet Schor (Sociology professor at Boston College) knows people my age love being connected and for young people driving means they have to disconnect from their technology, and that’s a negative. So if they could sit in the passenger side and still be connected, that’s going to be a plus.
To me, another plus is ridesharing represents something much bigger than trying to save money. I see it as evidence that people still depend on each other. My generation shares their cars and apartments the way neighbors used to share cups of sugar. For the system to work, some of us still need our own cars. But until I get my own version of the silver Super Beetle, you can find me on Twitter.
【小题1】The writer usually rideshares with _____.
A.anyone heading the same wayB.people he knows
C.friends of friendsD.strangers of his age
【小题2】Fewer young people choose to ride by themselves because _____.
A.driving means offering free rides to others.
B.getting a driving license becomes more difficult.
C.driving one’s own cars causes a negative impression.
D.driving makes them disconnected from technology.
【小题3】We can conclude from the passage that _____.
A.the writer rideshares just to save money
B.people under 18 are not allowed to drive
C.silver Super Beetle is the writer’s favorite
D.the older generation had to fight for freedom
【小题4】Which is the best title for the passage?
A.Teens use Twitter to thumb rides.
B.Tips on reducing risks in ridesharing.
C.Car is no longer a gateway to freedom.
D.New generation knows how to save money.