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.

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 16^thbirthday 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 way	B．people he knows
C．friends of friends	D．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.

   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.

   Most people love to lose themselves in a great book, maybe a classic novel, a modern storybook or a great work of history. But many people also live busy lives, and for them finding time to sit quietly and read is difficult, if not impossible. Fortunately, with the coming of the Internet and high-tech tools like the iPod, more and more people are making literature a part of their lives again.

A very special website now makes it possible for people to listen to books that they simply would not have time to read. The site is called Audible Inc., and it’s the best place to download audio (音频的) books. Over the past few years, hundreds of thousands of these books have been recorded. They include nearly every classic, as well as most newly-published ones. Most of these are read by voice actors who really bring the text to life.

Audible Inc. lets you easily and quickly download a book and load it onto your iPod or other MP3 players, or onto CDs so that you can listen in your car. The site is like Amazon, com, but for audio books. It includes thousands of recommendations (推荐) and customer reviews that are extremely helpful. The site lets you listen to a free piece of each book so you can tell ahead what the narrator (讲述者) sounds like. No wonder that most people who listen to an audio book for the first time are immediately attracted.

This is the perfect opportunity to find out what so many people know about audio books. But be careful — you may become attracted to audio books for life.

【小题1】Who might be most interested in Audible Inc.?

A．People who have iPods.	B．People who travel a lot.
C．Teenagers who love writing.	D．Book lovers with little free time.

【小题2】What does Audible Inc. offer people?

A．Free books.	B．Books to listen to.
C．Books about history.	D．Traditional paper books.

【小题3】Why is a free piece of each book given on Audible Inc.?

A．To let people experience the narrative style ahead.

B．To introduce different styles of modern books.

C．To provide a chance to learn to narrate stories.

D．To meet the customers’ requirements.

【小题4】What can we know from the last paragraph?

A．The author shows the benefits of audio books.

B．The author advises people to choose audio books.

C．The author stresses the great attraction of audio books.

D．The author warns people against addiction to reading.

   Perhaps you have heard a lot about the Internet, but what is it, do you know? The Internet is a network. It uses the telephone to join millions of computers together around the world.

Maybe that doesn’t sound very interesting. But when you’re connected (连接) to the Internet, there are a lot of things you can do. You can send e-mails to your friends, and they can get them in a few seconds. You can communicate with your friends through social software such as QQ, WeChat, and Facebook. You can also do with all kinds of information on the World Wide Web (WWW) .

There are many different types of computers now. They all can be linked to the Internet. Most of them are small machines sitting on people’s desks at home, but there are still many others in schools, offices or large companies. These computers are owned by people or companies, but no one really owns the Internet itself.

There are lots of places for you to surf the Internet. For example, your school may have the Internet. You can explore the Internet to search for useful information or knowledge in your classroom. However, in order to prevent yourself from playing with computer games, you should use it in limited time. Libraries often have computers joined to the Internet. You are welcome to use it at any time.

Thanks to the Internet, the world is becoming smaller and smaller. It is possible for you to work at home with a computer in front, receiving and sending the information you need. You can buy or sell whatever you want through the Internet. But do you know 98% of the information on the Internet is in English? So what will English be like tomorrow?

【小题1】What is the passage mainly about?

A．The Internet.	B．Information.
C．Computers.	D．English.

【小题2】According to the passage, you can do all the following things through the Internet except for_______.

A．sending and receiving e-mails	B．chatting with your friends
C．buying and producing things	D．dealing with information

【小题3】Who is the owner of the Internet?

A．The headmaster.	B．The government officer.
C．The user.	D．No one.

【小题4】What does the writer try to tell us in the last two sentences of the last paragraph?

A．The Internet is more and more popular.

B．English is important in using the Internet.

C．The information on the Internet is all in English.

D．Every computer must be joined to the Internet in English.