Caffeine not only gives us a daily jump start, but new research suggests it also can strengthen long-term memory.

According to the US Food and Drug Administration, nearly 90 percent of people worldwide consume about 200 milligrams of caffeine each day. That' s equivalent to about one strong cup of coffee a day. Writing in " Nature Neuroscience" , Johns Hopkins University researchers say their findings show that caffeine strengthens certain memories for up to 24 hours after being taken in.

" We've always known that caffeine has cognitive-enhancing effects (促智效果) , but its particular effects on strengthening memories and making them resistant to forgetting has never been examined in detail in humans, " said senior author of the paper Michael Yassa. " We re- port for the first time a specific effect of caffeine on reducing forgetting over 24 hours. " Conducting a double-blind trial, the researchers worked with a test group of people who didn't regularly consume caffeinated products. Five minutes after studying a series of images, the test subjects were given either a placebo(无效对照剂) or a 200-milligram caffeine tablet.

To check the caffeine levels of their test subjects, the research team took saliva samples (唾液样品) from them before they took their tablets and again one, three and 24 hours afterwards.

Both groups of test participants ( those who took the placebo and those who took the caffeine tablet) were tested the following day to see if they could recognize the images they' d seen the previous day.

The test included showing the test subjects another series of images that included some new images , those that were shown the previous day, as well as other images that were similar, but not the same as those they had viewed earlier.

The researchers found that more members of the group who were given the caffeine tablets were able to correctly identify some of the new images as " similar" to previously viewed images rather than incorrectly identifying them as the same.

"We also know that caffeine is associated with health and longevity(长寿) and may have some protective effects from cognitive decline like Alzheimer' s disease (阿尔茨海默症). " said Yassa.

1.The purpose of the new research is ____________.

A.to examine caffeine ' s memory-strengthening effects in detail

B.to write the paper " Nature Neuroscience"

C.to prove caffeine has cognitive-enhancing effects

D.to survey how much caffeine people consume a day

2. During the research , the researchers did the following things EXCEPT ________.

A.giving the test subjects placebos or caffeine tablets

B.checking the caffeine levels of the test subjects

C.showing the test subjects series of images

D.encouraging the test subjects to drink more coffee

3. How did the test subjects show the caffeine ' s memory-strengthening effects?

A.By taking the caffeine tablets instead of placebos.

B.By recognizing images they ' d seen the previous day.

C.By identifying the new images as the same.

D.By telling the differences between new images.

4.What will the next part of the text possibly talk about?

A.Ways to achieve health and longevity.

B.The harmful effects of cognitive decline.

C.The treatment for Alzheimer' s disease.

D.The effects caffeine has on health.

If you are looking for the place that has everything, there is only one place to visit, and that’s New York. It’s a whole world in a city.

The World of Theater: All of New York is a stage. And it begins with Broadway. Where else can you find so many hit shows in one place? Only in New York!

The World of Music: Spend an evening with Beethoven at Lincoln Center. Swing to the great jazz of Greenwich Village. Or rock yourself silly at the hottest dance spots found anywhere.

The World of Art: From Rembrandt to Picasso. From Egyptian tombs to Indian teepees. Whatever kind of art you like, you will find it in New York.

The World of Fine Dining: Whether it’s roast Beijing duck in Chinatown, lasagna in little Italy, or the finest French coq au vin found everywhere, there is world of great taste waiting for you in New York.

The World of Sights: What other city has a Statue (雕塑) of Liberty? A Rockefeller Center? Or a Bronx Zoo? Where else can you take a horse-drawn carriage through Central Park ? Only in New York !

1.From the text we know that “Rembrandt” is most likely to be the name of a famous .

A. actor B. musician C. cook D. painter

2.Which of the following can visitors do only in New York?

A. To see the Statue of Liberty.

B. To taste the finest French coq au vin.

C. To enjoy a Beethoven concert.

D. To eat Roast Beijing Duck.

3.This passage may be taken from .

A. a handbook for English learners

B. a guidebook for foreign travellers

C. a pocketbook for businessmen

D. a storybook for local readers

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。(注意:如果此题有选E则在该题答题卡中用2B铅笔涂黑AB两格;选F则涂黑BC两格;选G则涂黑CD两格。)

Maybe you are an ordinary student. 1. This is not necessarily so. Anyone can become a better student if he or she wants to. Here’s how:

Plan your time carefully. When planning your work, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First arrange your time for eating, sleeping, dressing, etc, then decide a good, regular time for studying. 2. A weekly schedule may not solve all your problems, but it will force you realize what is happening to your time.

Make good use of your time in class. 3. Listening carefully in class means less work later. Taking notes will help you remember what the teacher says.

Study regularly. When you get home from school, go over your notes, review the important points that your teacher is going to discuss the next day, read that material. 4. If you do these things regularly, the material will become more meaningful, and you will remember it longer.

Develop a good attitude towards tests. The purpose of a test is to show what you have learned about a subject. The world won’t end if you don’t pass a test, so don’t be over worried.

5. You will probably discover many others after you have tried these.

A. This will help you understand the next class.

B. You probably think you will never be a top student.

C. Don’t forget to set aside enough time for entertainment.

D. No one can become a top student unless he or she works hard.

E. There are other methods that might help you with your study.

F. Take advantage of class time to listen to everything the teacher says.

G. Make full use of spare time to take note of what the teacher says in class.

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