American researchers say drinking tea may help strengthen the body’s defense system against infection（感染）．Doctors at Brigham and Women’s Hospital in Boston，Massachusetts，did the study．The team studied a chemical found in black，green，oolong and pekoe tea This chemical is an amino acid（氨基酸）called L-theanine．The scientists say it may increase the strength of Gamma delta T cells，which are part of the body’s defenses．

First，the researchers mixed some of these cells with antigens（抗原）found in the amino acid Antigens help the body react to infection．Then the scientists added some bacteria（細(xì)菌）．

Within twenty-four hours，the cells produced a lot of interferon，a substance that fights infection Cells not mixed with the antigens did not produce interferon．

In the second part of the study，eleven people drank five to six cups of black tea every day．Ten other people drank the same amount of instant coffee．That is dried coffee mixed with hot water．

Two weeks later，and again two weeks after that，the researchers tested the blood of all twenty-one people．They also looked at what happened when they added bacteria to the blood cells．They found that the tea drinkers produced five times more interferon after they started drinking tea The coffee drinkers did not produce interferon．

Doctor Jack Bukowski led the study He says the antigens added to the Gamma delta T cells were responsible for the increased reaction to the bacteria．He says the study also showed that the cells were able to remember the bacteria and fight them again the next time．

Earlier research already has found that tea can help prevent heart disease and cancer Doctor Bukowski says the new study must be repeated with more people．If the findings prove to be true，he says，then tea drinking might also help protect against bacterial infections．He says the amino acid L-theanine could be removed from tea and used as a drug to strengthen the body’s defenses．

73．We may know from the text that     can be found in different kinds of tea．

A．Gamma delta T cells                               B．L-theanine

C．interferon                                       D．bacteria

74．Tea may help strengthen the body’s defense system because it helps    ．

A．the body to produce more interferon

B．the body to produce more Gamma delta T cells

C．to add some bacteria to the blood cells

D．to mix antigens with some of the cells in the body

75．According to Dr Bukowski，    ．

A．the findings of the study have already proved to be true

B．he bas taken some amino acid L-theanine from tea and made a drug with it

C．further study is needed to prove the findings true

D．he is not sure whether tea can help prevent heart disease and cancer

 

【答案】

73-75BAC

【解析】略

 

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源： 題型：051

New comers to the United States are often surprised by the schools.American schools sometimes seem so different from schools they know in other parts of the world.American education is based on the idea that children need to learn to think for themselves.The school should be the place where they learn to do this.In school,children learn the“three R's”（Reading,Writing and Arithmetic）,history and government（often called Social Studies）and many other subjects.They also learn how to be independent,how to make their own judgment,and how to develop their own abilities and interests.The American teacher does not want the children in her class to sit with hands folded quietly and to say nothing.She wants them to listen attentively,to ask questions.She knows what children learn from books is important.She also knows that it is necessary for them to know how to use this learning for their growth and development.During Open School Week,parents have a chance to see how American education works.?

1.What is the best title of the passage?（Please answer within 10 words.）?

___________________________?

2.What is the idea of American education??

___________________________

3.Can you tell us the differences between American education and Chinese education?（Please answer it within 30 words.）?

___________________________

4.Please translate the underlined sentence into Chinese.?

___________________________?

5.Do you think American education is fit for Chinese students?Why?（Please answer it within 40 words.）?

___________________________?

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：

短文填詞（共10小題，每小題1分，滿分10分）

       閱讀下面的短文，用三種形式完成短文，使文章語(yǔ)義完整，連貫。（①根據(jù)上下文填空；②用所給單詞的正確形式填空；③根據(jù)單詞所給首字母填空。每空一詞。）請(qǐng)將答案寫(xiě)在右邊對(duì)應(yīng)題號(hào)的橫線上。

Dear Christie，

       I’m here in the National Park, in      （southeast）California.             72.    

I have been t     around the state of California for three weeks              73.    

now, It's very different from        I have seen in American movies.           74.    

Not everyone is rich and not everyone l      near the beach. I first        75.    

travelled southeast      rich farmland then to the central part.        76.    

They grow e      here including cotton，vegetables，nuts and              77.    

fruit．They raise cattle too．Then I traveled    （far）southeast into            78.    

mountains and desert. Californians are very friendly,      they are         79.    

from many different r     and cultures. Every cuIture has its own         80.       ，

music，food and art. I show great interest in them．         81.    

       Wish you were here. Give my love to Paula.

                                             Yours，

                                             George

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：山西省太原市2010年高三基礎(chǔ)知識(shí)測(cè)試單項(xiàng)選擇 題型：閱讀理解

 

I am so worried about global warming. We need stop cutting down all of the trees so that they can absorb the carbon dioxide. I think the Kyoto Protocol （京都議定書(shū)） to stop pollution is a great idea ,and I hope our country will decide to follow it, too.

                                                             — Eli S.,10,Texa

People should do all they can to help stop pollution, even if it is something as little as recycling your soda can. Every little thing helps. Maybe schools can put recycling bins in classrooms. Students can bring in all of their cans and bottles and see how many the school can collect.

                                                  — Lindsey A.,11, Massachusett

The United States should take action to help stop pollution. Since we are one of the richest countries, we should at least spend a little money to help.

                                                  — Aaron z,11,Massachusett

It is not good that the United States is not following the Kyoto Protocol. The U.S. is one of the most pollution emitting （污染物排放）countries in the world. Even if the rest of the world agrees to follow those rules, without the U. S. and its big businesses agreeing, global warming will still be a big problem.

                                                         —Augustine S.,11,Ohio

The world needs to learn more about global warming problems. If we do not do something soon then some of Earth’s coolest animals will become extinct. People should use solar power instead of things that pollute the atmosphere!

                                                    — Jillian J.,10,Pennsylvania

Global warming is very dangerous, and it must be prevented. Even if people think that it cannot be stopped ,we should  at least try. Stopping global warming is more important than keeping our businesses going. What about the penguins（企鵝）and the polar bears? We can’t just let them become extinct.

                                                        —Samantha R.,11,Illinois

72．Why does Lindsey suggest schools put recycling bins in classrooms?

       A．To keep the classroom clean            B. To help protect wild animals.

       C．To help protect our earth.            D. To collect waste in classroom.

73．Augustine worries that global warming problems will be difficult to solve because       .

         A．many people think that global warming cannot be stopped

       B．more and more trees are being cut down

       C．American government spends little money stopping pollution

       D．the U.S. refuses to follow the Kyoto Protocol

74．Jillian and Samantha believe that      .

       A．solar power is earth-friendly energy  

         B．global warming threatens animals’ survival

         C．America is the richest country in the world

         D．the penguins and the polar bears are dying out

75．What do the six children mainly talk about?

         A．Environmental problems.    B．The Kyoto Protocol.

         C．Animal protection.                       D．The climate change.

 

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：20102011年河南省高二下期末考試英語(yǔ)試題 題型：閱讀理解

Shopping in the United States changes a lot．About ninety years ago most people shopped in small stores that were owned by one person or a family．Women went from the bakery to the butcher’s to the grocer and on to the fruit and vegetable seller in order to get their food for the week．Then, about sixty years ago, supermarkets were born．In a supermarket, people could get all the different kinds of food they needed without going to different stores．

    The next big change in shopping in the United States was the shopping mall．A shopping mall is a group of stores under one roof．Because malls allowed people to shop without worrying about the weather, they soon became very popular．The mall became a place for people to socialize in addition to shopping．If you walk through a mall, you will see older people sitting, chatting and drinking coffee．Malls are places for teenagers to hang out．Many teens will often just “go to the mall” and spend time with their friends．

    The recent change in American shopping was the superstore．Large chain stores such as Wal-Mart, Office Depot and Toys “R” Us have been built all across the United States．Because they are so large, they can buy goods at a great discount and sell them much cheaper than smaller stores．Sometimes, when they are built near small towns, many of the small town stores have to close．They just cannot compete with their giant neighbors．

    And now, online shopping is becoming more and more popular all over the States．People are too busy to go to the physical stores, so they go shopping over the Internet．Online shopping has lots of advantages．For instance, online stores are usually available 24 hours a day．Searching or browsing online shops can be faster than browsing the physical stores．While, online shopping also has its disadvantages．People are at higher risk of being cheated on the part of the merchant than in a physical store．And privacy of personal information may be let out．

1.Which of the following shows the right order of shopping development in the United States?

    ①small stores  ②superstores  ③shopping malls  ④shopping online ⑤supermarkets

    A．①②③④⑤     B．①⑤③②④     C．②③④①⑤     D．①⑤②③④

2.Which is the place for people to spend time with others according to the passage?

    A．Small stores． B．Supermarkets． C．Shopping malls D．Superstores．

3.Why can the superstores sell products at much lower prices?

    A．Because they can buy goods at a reduction in price．

    B．Because they are across the United States．

    C．Because they sell all kinds of products people need．

    D．Because they are built near small towns．

4.What’s the disadvantage of online shopping according to the passage?

    A．Wasting time．                   B．Fixed prices．

    C．No chance to do physical activities. D．Leaking personal information．

 

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：20102011學(xué)年廣西北海市合浦縣教研室高二上學(xué)期期末考試英語(yǔ)試卷 題型：完形填空

閱讀下面短文，從短文所給各題的四個(gè)選項(xiàng)（A、B、C、D）中選出能填入相應(yīng)空白處的最佳選項(xiàng)。

   Newcomers（新來(lái)的人） to the United States are often    36    by the schools. American schools    37    seem so different from the schools they know in    38    parts of the world. American education is based on the    39    that children    40    to learn to think    41    themselves. The school should be the    42    where they learn to do this.    43   , children learn the “three R’s” [(Reading, Writing and Arithmetic(算術(shù))], history and government (often called Social Studies) and many other    44   . They also learn    45   be independent(獨(dú)立的)，how to make their own judgement(判斷), and how to develop their own   46    and interests. The American teacher does not    47   the children in her class to sit    48   hands folded quietly and to say    49  . She wants them to listen attentively(專心地) to ask questions. She knows that    50    children learn from books is    51  . She also knows that it is necessary for them to know how to use this    52   for their   53    and development. During Open School Week, parents have a    54    to see how American education    55   .

【小題１】A. happy          B. afraid               C. glad             D. surprised

【小題１】 A. some time    B. sometime         C. sometimes            D. some times

【小題１】A. other          B. the other            C. another              D. all

【小題１】 A. opinion      B. idea                 C. promise          D. conclusion

【小題１】A. need           B. needed               C. dare                 D. dared

【小題１】A. of             B. against          C. for                  D. with

【小題１】 A. place         B. space            C. room             D. area

【小題１】A. From school    B. out school           C. By school            D. In school

【小題１】A. lessons       B. knowledge       C. subjects             D. object

【小題１】 A. when to       B. how to           C. what to              D. where to

【小題１】A. ability        B. skill                C. abilities            D. skills

【小題１】 A. think         B. want                 C. let              D. make

【小題１】 A. with          B. across               C. over             D. above

【小題１】A. something      B. anything             C. nothing              D. much

【小題１】A. that          B. which            C. where                D. what

【小題１】A. important     B. unimportant      C. necessary            D. useless

【小題１】A. study         B. work             C. learning             D. aim

【小題１】A. growing       B. growth           C. future               D. tomorrow

【小題１】A. ability            B. possibility          C. interest             D. chance

【小題１】A. develops      B. learns               C. goes             D. works

 

查看答案和解析>>

同步練習(xí)冊(cè)答案