No one knows for certain why people dream, but some dreams misht be connected to the mental processes that help us learn. In a recent study, scientists found a connection between nap-time (午睡时间) dreams and better memory in people who were learning a new skill.
“I was astonished by this finding,” Robert Stickgold told Science News. He is a cognitive neuroscientist at Harvard Medical School who worked on the study of-how the brain and nervous system work, and cognitive studies look at how people learn and reason. So a cognitive neuroscientist may study the brain processes that help people learn.
In the study, 99 college students between the ages of 18 and 30 each spent an hour on a computer, trying to get through a virtual maze (虚拟迷宫). The maze was difficult, and the study participants had to start in a different place each time they tried - making it even more difficult. They were also told to find a particular picture of a tree and remember where it was.
For the first 90 minutes of a five-hour break, half of the particularity stayed awake and half were told to take a short nap. Participants who stayed awake were asked to describe their thoughts. Participants who took a nap were asked about their dreams before sleep and after steep - and they were awakened within a minute of sleep to describe their dreams.
About a dozen of the 50 people who slept said their dreams were connected to the maze. Some dreamed about the music that had been playing when they were working; others said they dreamed about seeing people in the maze. When these people tried the computer maze again, they were generally able to find the tree faster than before their naps. However, people who had other dreams, or people who didn’t take a nap, didn’t show the same improvement.
Stickgold suggests the dream itself doesn’t help a person learn - it’s the other way around.
【小题1】It is a cognitive scientists job to study__     .

Complete the sentences with the correct forms of the phrases in the box

The railway has been ________ for half a year.

Look, this is the first plane in the world to be created using the new technology of “3D printing”. The airplane was built using only a computer—but it can fly at a speed of 100mph and has a two-meter wingspan.

         It was produced using a special nylon laser printer that builds up something layer-by-layer. The parts were made separately and attached using a “snap fit” technique so the aircraft could be put together without tools in minutes.

         No fasteners at all were used in the manufacture of the plane. Unmanned and electrically powered, the plane can travel in near silence and is also equipped with a small autopilot system. The special production process used is known as “laser sintering (激光烧结)”and allows the designers to create shapes and structures that would normally include costly manufacturing techniques. This technology allows a highly-tailored aircraft to be developed from your own design to first flight in days, while using traditional materials and techniques would take months. And because no tooling is required for manufacture, major changes to the shape and scale of the aircraft can be made with no extra cost.

         Professor Jim Scanlon, who led the team, said, “The process allows the design team to revisit historical techniques and ideas that would have been too expensive using traditional manufacturing.” He added, “This form of structure is very firm and lightweight, but very complex. If it was manufactured traditionally it would require a large number of individually tailored parts that would have to be connected or fastened at great expense.”

         The new printed plane is known as the Southampton University Laser Sintered Aircraft—or SULSA for short—and is part of a wider project using cutting-edge manufacturing techniques. The University of Southampton has been at the leading position of Unmanned Aerial Vehicle development since the early 1990s.

1.Which of the following would be the best title for the text?

A. Revolutionary Breakthrough of 3D Printer

Scientists Create Aircraft with High Speed

C. New Designed Airplane with New Techniques.

D. The World’s first 3-D printed Airplane, SULSA

2.How could the plane work while flying?

A. It should be controlled by an autopilot system.

B. It should be controlled by “laser sintering”.

C. A pilot controls it using a remote control.

D. A pilot with high techniques controlled it.

3.This kind of plane has the following advantages EXCEPT ______.

A. it produces little noise while flying

B. it is manufactured in quite a short time

C. it only requires simple and cheap tools

D. it needn’t extra cost if changes are made

4.Professor Jim Scanlon believes they can _____ with their techniques.

A.produce firmer and lighter real planes easily

B.connect and fasten tailor parts for real planes

C.copy earlier planes to study their techniques

D.find differences by studying the traditional ones

“Hi，howareya.” some people say when they see a familiar face.The words run together into a mass，all sense and meaning lost. All the same，people do care how you are.After they greet you，it’s likely you will greet them back，with an equally meaningless phrase like，“Can’t complain，can’t complain.”You could probably complain，at length，or share a brilliant thought you were just beginning when a greeting interrupted you.You don’t though，you say，“Great，you？”

You are not giving each other information about your health and well?being.All the same，you are sharing information.You’re acknowledging each other’s positions as acknowledged friends，or at least as accepted acquaintances.And you are reestablishing the ties that may have lapsed(衰退) since yesterday，when you last met at the elevator or the entrance to the train station.

It’s what anthropologist(人类学家) Bronislaw Malinoski called a phatic(交流感情的) communication.Its message is not in the words you use，but in the fact that you speak ritually(仪式上地) accepted words.In Asia，for example，people may ask one another if they have eaten，or if they are busy.They’re not really asking for their lunch menu or their agenda，they are saying hello.A phatic signal merely says, “I see you there.” It says hi.

There’s embarrassment of being near people without acknowledging them.That uncomfortable feeling is one reason why lonely passengers in the subway may behave as if they cannot see anyone around them or may escape their uncomfortable situation with a book.Some people read all the way home，and never turn a page.

Your friend isn’t asking how you are，and you aren’t telling him.However，he is recognizing your existence，and when you answer，you are recognizing his.In addition，the set speech you have shared opens the door to closer communications if both agree.Someday，you may come to real close friendship，and really tell one another how you are.

Meanwhile，people who greet one another this way do care.They care enough to recognize someone’s essential humanity(人性)．They send a signal across the space between，to share，very briefly and lightly，in awareness of one another.

Your greetings prove that neither of you has become a social outcast.How are you？You are still a member of society in good status.You are still the one who knows the rituals and secret passwords necessary to get to work each day.

1.When people greet，they ________.

A．want to show their different educational backgrounds

B．show nothing related with the words themselves

C．want to know other people’s privacy

D．express something special

2. According to Bronislaw Malinoski，a phatic communication ________.

A．is rarely used by Asian people

B．is too complex to be used often

C．helps establish or keep certain relationships

D．often ruins the normal relationships between friends or acquaintances

3.Some people seldom greet strangers because ________.

A．they want to be polite to others

B．they feel uncomfortable to do it

C．they don’t know when to greet them

D．they want to do something meaningful

4.What does the text mainly tell us?

A．Greetings should be given better expressions.

B．Greetings convey different meanings to different people.

C．Greetings help prove an individual’s social independence.

D．Greetings help an individual be connected with the society.

Half a century ago, during the Sino-Japanese War, I was a student at National Southwest Associated University at Kunming in southern China, Lectures were often accompanied by the pitter-patter of rain on the tin roofs of the classrooms; that mud floors were full of holes; and wind blew through paneless windows. As for the library, it was a bare skeleton. A good reference book was used for years and journals usually arrived after a couple of years’ delay.
But despite such hardship, I had the best of my student days in Kunming. Although we were short of research materials, we were uncompromising（坚定的）in our pursue of knowledge and truth. I spent six years at Southwest and obtained my first and second degrees in physics here. I still value those days fervently. In fact it was at Southwest that I first came across Reader’s Digest. To me, the magazine’s insistence on perfection both in style and accuracy—as well as its celebration of life even in the face of hardship—is similar to the values I learned at Southwest.
Later, I went to the United States to study under Enrich Ferimi, the famous physicist who directed the world’s first nuclear chain reaction. One of the first things Ferimi emphasized to me was that physics shouldn’t be so overwhelming（压倒性的）that it is beyond the average man. Physics research, he said, should be connected with our daily lives and physicists should devote most of their efforts to solving practical problems. I couldn’t agree more. Indeed, I think this simple, close-to-life.
Approach applies other attempts too. Reader’s Digest is highly informative, but it is easy to read, and easy to understand, never exaggerating or mystifying. This truthful, down-to earth quality is what I treasure now.
【小题1】What is the author?