Every animal sleeps,but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month.{#blank#}1{#/blank#} 

    One idea is that sleep helps us strengthen new memories. {#blank#}2{#/blank#} We  know that, while awake,fresh memories are recorded by reinforcing (加强)connections between brain cells, but the  memory processes that take place while we sleep  have been unclear.

    Support is growing for a theory that sleep evolved so that connections between neurons(神经元)in the brain can be weakened overnight, making room for fresh memories to form the next day.  {#blank#}3{#/blank#}

    Now we have the most direct evidence yet that he is right. {#blank#}4{#/blank#} The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep,showing that the connections between neurons weaken while sleeping.

If Tononi's theory is right, it would explain why, when we miss a night's, we find it harder the next day to concentrate and learn new information —our brains may have smaller room for new experiences.

    Their research also suggests how we may build lasting memories over time even though the synapscs become thinner. The team discovered that some synapses seem to be protected and stayed the same size. {#blank#}5{#/blank#}  “You keep what matters,” Tononi says.

    Taking good notes is a time-saving skill that will help you to become a better student in several ways.{#blank#}1{#/blank#} Second,your notes are excellent materials to refer to when you,are studying for a test.Third,note-taking offers variety to your study time and helps you to hold your interest.

    You will want to take notes during classroom discussions and while reading a textbook or doing research for a report.{#blank#}2{#/blank#}.Whenever or however you take notes,keep in mind that note-taking is a selective process.{#blank#}3{#/blank#}

    The following methods may work best for you.

    Read the text quickly to find the main facts arid ideas in it.

    Carefully read the text and watch for words that can show main points and supporting facts.

    Write your notes in your own words.

    {#blank#}4{#/blank#}

    Note any questions or idea you may have about what was said or written.

    As you take notes,you may want to use your own shorthand（速记）.When you do,be sure that you understand your symbols and that you use them all the time.{#blank#}5{#/blank#}

A.Use words,not complete sentences.

B.There are three practical note-taking methods.

C.You must write your notes on separate paper.

D.Otherwise,you may not be able to read your notes later.

E.You will also want to develop your own method for taking notes.

F.That means you must first decide what is important enough to include in your notes.

G.First,the simple act of writing something down makes it easier for you to understand and remember it.

    Here are some top tips for world travelers.

    Travel light.{#blank#}1{#/blank#}. It's no fun carrying a huge bag around a foreign city. Don't take too many clothes and avoid heavy books and electrical equipment.

    {#blank#}2{#/blank#}. Always keep your passport on you in an inside pocket or special travel belt. Th ere may be thieves about. It's a good idea to make a photocopy(复印件) of your passport and travel documents.

    Transport sense. Don't let go of your bags on the train. {#blank#}3{#/blank#}. There are always thieves on public transport. If you want to sleep, tie your bag to your arm. When you take a taxi, it's a good idea to ask for the driver's permit. Many foreigners pay too much money because they take unofficial taxis.

    Keep clean．It's a good idea to wear dark clothes because they hide the dirt while white clothes attract it! Make sure you have plenty of clean underclothes and deodorant (除臭剂).{#blank#}4{#/blank#}.

    {#blank#}5{#/blank#}. You should always be polite and respectful towards the locals. Even if you find their habits and behavior a bit strange, you shouldn't show your feelings. Remember, you're their guest.

A. Be polite.

B. Keep your documents safe.

C. You should carry a spare bag.

D. You don't want to smell bad!

E. Keep them with you at all times.

F. Make sure your bag isn't too heavy.

G. It's a good idea to wear similar clothes to the local people.

They Just Can't Help It

    My theory is that the female brain is mainly built for empathy — the ability to understand other people — and that the male brain is mainly built for building systems. {#blank#}1{#/blank#} For example, women are more likely to read magazines on fashion and parenting, while men will choose magazines that feature computers and sport.

    You may think that these preferences are influenced by the way people are taught to behave when they are growing up. However, this is not the case. A new study carried out at Cambridge University shows that newborn girls look longer at a face, and newborn boys look longer at a mobile.{#blank#}2{#/blank#} It has also been observed (that girls are better at noticing signs of changes in other people's feelings. Boys, however, seem to enjoy building toy towers and playing with toys which have clear functions. {#blank#}3{#/blank#} People whose jobs are in the construction industries are almost male. Math and engineering, which require high levels of systems-thinking, are also male-chosen disciplines. Why do men and women have the difference? Actually women have four times as many brain neurons (神经) that connect the right and left part of their brains. Because of it, women have a better ability to multitask than men. {#blank#}4{#/blank#} Men tend to focus on a limited number of problems at a time. They will separate themselves from problems and view tasks as independent from one another.

    Some people may worry that I am suggesting one gender (性别) is better than the other, but this is not the case. My theory says that males and females differ in the kinds of things that they find easy, but that both genders have their strengths and weaknesses. {#blank#}5{#/blank#} It is not true. The study simply looks at males and females as two groups, and asks what differences exist, and why they are there.

A. Generally speaking, there are clear differences.

B. Their preference for building systems may change over time.

C. You can see the same kind of pattern in the adult workplace.

D. They will consider many sources of information at the same time.

E. It is important to stress that the female brain may be built more for empathy.

F. That suggests certain differences between male and female brains are biological.

G. Others may think the theory creates a belief of what a particular type of person is like.

Sports Fans and Identity

    Many people are crazy about a particular sports team. They are big fans and seem to connect their own identity to their chosen team.

    Identity consists of things like gender (性别), personality, abilities, and social groups. The groups we belong to shape our identity. Related to this is the theory developed by Henri Tajfel and John Turner. {#blank#}1{#/blank#} In knowing who we are, we may more closely identify with our social group than with our gender group. We also decide which group we belong to, based on different aspects of our identity. According to the theory, our self-esteem—how we feel about ourselves—is reflected in the group we belong to. {#blank#}2{#/blank#} For example, we naturally protect the group we belong to, while making other groups less important. We think highly of the team we support, while we may add negative comments about an opposing team.

    Researchers have studied language used by sports fans. {#blank#}3{#/blank#} By using pronouns like “we”, fans show that they feel connected with the team when it is winning. “We really killed that team. They couldn't get the ball past us.” However, when their team didn't do well, the fans would distance themselves from the team, using different pronouns. “They didn't know what they were doing. They had no planning.”

    {#blank#}4{#/blank#} They have found those fans have more self-confidence and feel more competent. They are quite sure they have the ability to deal with situations successfully or do things to a satisfactory standard. {#blank#}5{#/blank#} These people will perform better at work and earn and spend more money, so experts suggest that a winning team may have a positive influence on the economy of a city.

A. They suggested that we naturally classify people into groups.

B. That causes increased competitions between different groups of sports fans.

C. It is probably because the victory reflects well on their personal sense of identity.

D. Comments from group members certainly have a strong influence on our behavior.

E. When their team did well, the fans would closely identify themselves with the team.

F. That leads to the fact that we want our group to be seen more positively than other groups.

G. Social scientists have also studied the effect of winning a championship on the fans of the winning team.

I have worked for a local charity for many years. I volunteered there as one of the youth group leaders. The job sometimes was tiring. {#blank#}1{#/blank#} And one of our favorite activities is called "ARK night" — A couple of times a year, on a Sunday night, all kids in the charity went into our community to perform kind acts for others.

{#blank#}2{#/blank#} One group typically goes downtown and hands out sandwiches, water and bread. Another group makes posters and goes to local police and fire stations to say "Thank you". Our group often visits nursing homes and hospitals.

One time, the group I was leading left post-it notes (便利贴) with positive messages on the cars in a hospital's parking lot. The hope was that someone who was sad after visiting a patient would be cheered up by our notes. {#blank#}3{#/blank#} I made the kids write positive messages on the notes. Then we went out to put those notes on cars.

After the kids left their notes on the cars, one girl said, "We didn't see one single person tonight. How will we know our notes made a difference?" I replied, "{#blank#}4{#/blank#}" But actually I wondered about it, too. Would the notes cheer anyone up? But I had to take those kids back before 9:00 pm.

Later I got the answer. On Monday morning I found a post online by a woman. She described her bad luck over the weekend. "But then," she added, "this morning I found the nicest little note on my car. It made my day." She included a photo of the note. It was one of our notes! {#blank#}5{#/blank#}

A. Let's stay here and find out.

B. We'll just have to trust that they did.

C. The drivers were surprised by our special notes.

D. But I loved working with those little volunteers.

E. I smiled and couldn't wait to tell the kids the good news.

F. We had spent the first part of the evening preparing notes.

G. The kids are divided into small groups, with each group having a different task.