American researchers say drinking tea may help strengthen the body’s defense sys - 高中英语试题 - 超级试练试题库

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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（细菌）．
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

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73-75BAC

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试题【American researchers say drinking tea may help strengthen the body’s defense sys】；主要考察你对题材分类等知识点的理解。[详细]

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People tend to think of computers as isolated machines, working away all by themselves. Some personal computers do without an outside link, like someone"s secret cabin in the woods. But just as most of homes are tied to a community by streets, bus routes and electric lines, computers that exchange intelligence are part of a community local, national and even global network joined by telephone connections.
　　The computer network is a creation of the electric age, but it is based on old-fashioned trust. It cannot work without trust. A rogue (流氓) loose in a computer system called hacker is worse than a thief entering your house. He could go through anyone"s electronic mail or add to, change or delete anything in the information stored in the computer"s memory. He could even take control of the entire system by inserting his own instructions in the software that runs it. He could shut the computer down whenever he wished, and no one could stop him. Then he could program the computer to erase any sign of his ever having been there.
Hacking, our electronic-age term for computer break-in is more and more in the news, intelligent kids vandalizing（破坏）university records, even pranking (恶作剧) about in supposedly safeguarded systems. To those who understand how computer networks are increasingly regulating life in the late 20th century, these are not laughing matters. A potential for disaster is building: A dissatisfied former insurance-company employee wipes out information from some files; A student sends out a "virus", a secret and destructive command, over a national network. The virus copies itself at lightning speed, jamming the entire network thousands of academic, commercial and government computer systems. Such disastrous cases have already occurred. Now exists the possibility of terrorism by computer. Destroging a system responsible for air-traffic control at a busy airport, or knocking out the telephones of a major city, is a relatively easy way to spread panic. Yet neither business nor government has done enough to strengthen its defenses against attack. For one thing, such defenses are expensive; for another, they may interrupt communication, the main reason for using computers in the first place.
59. People usually regard computers as      .
A. a small cabin at the end of a street
B. part of a network
C. means of exchanging intelligence
D. personal machines disconnected from outside
60. The writer mentions “ a thief ”in the second paragraph most probably to      .
A. look into the case where hackers and thieves are the same people
B. demand that a computer network should be set up against thieves
C. tell people that thieves like to steal computers nowadays
D. show that a hacker is more dangerous than a thief
61. According to the passage , a hacker may do all the damages below EXCEPT     .
A. destroying computer systems .
B. creating many electronic-age terms .
C.. entering into computer systems without being discovered
D. attacking people’s e-mails
62. By saying “ Now exists the possibility of terrorism by computer ”(the underlined ) the writer means that     .
A. students who send out a “ virus ”may do disastrous damages to thousands of computers
B. some people may spread fear in public by destroying computer systems
C. some employees may erase information from some files
D. some terrorists are trying to contact each other using electronic mails

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The United States is on the verge of losing its leading place in the world’s technology. So says more than one study in recent years. One of the reasons for this decline is the parallel decline in the number of U.S. scientists and engineers.
Since 1976, employment of scientists and engineers is up 85 percent. This trend is expected to continue. However, the trend shows that the number of 22-year-old    the near term source of future PhDs is declining. Further adding to the problem is the increased competition for these candidates from other fields    law，medicine，business，etc. While the number of U.S. PhDs in science and engineering declines，the award of PhDs to foreign nationals is increasing rapidly.
Our inability to motivate students to pursue science and engineering careers at the graduate level is compounded because of the intense demand industry has for bright Bachelor‘s and Master‘s degree holders. Too often，promising PH.D.candidates, confronting(面临) the cost and financial sacrifice of pursuing their education, find the attraction of industry irresistible.
67. The U.S.will come to lose its leading place in technology probably because ________.
A. scientists and engineers are not employed
B. the number of PH.D. degree holders is declining
C. the number of scientists and engineers is decreasing
D. the number of 22-year-ilds is declining
68. The field of science and engineering is facing a competition from ________ .
A. postgraduates              B. technology
C. such fields as law，medicine and business
D. foreign nationals
69. Large-scale enterprises now need _______.
A. new inventions    B. engineers
C. advanced technology          D. bright graduates and postgraduates
70. PH.D. candidates "find the attraction of industry irresistible" means that _________.
A. they cannot work for industry any longer
B. they find industry is attracting more and more college students
C. they don’t think they can prevent themselves from working for industry
D. they cannot resist any attraction from all sides

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第三节完形填空(共20小题；每小题1.5分，满分30分)
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
It used to be our custom to take handmade baskets to friends on May Day．We would   21   baskets on a doorstep, knock on the door, and then run away as fast as our legs could   22   us．It was delightful to peer (窥视) around a bush and watch our friends open their   23   and pick up the colorful gift,   24   who had left it out for them.
I clearly   25   the May Day of the year when I turned ten．That year I was faced with a(an)   26   involving one of my dearest friends, Pam．We had studied and   27   together nearly every day, but things   28   after a new family had moved into our small town．Pam was spending more and more time at their house and I felt   29 and left out.
When my mother asked me   30   I was going to take a May Day basket to Pam’s house, I responded   31   , “Absolutely not! I hate Pam.” I began to cry.
Mom wiped away my   32   and told me that things and people change．She explained that one of the greatest things friends can do is to give each other a   33   to grow, to change and to develop, and that it’s   34   for one’s friends to spend time with other people.
I   35 decided to give Pam a basket as a sign of forgiveness, and asked my sister to help me do it．As we watched from our   36   place, Pam picked up the basket and said loudly enough for us to hear, “Thank you, Susie, I hoped you wouldn’t   37   me!”
That day, I made a   38   that changed my life: I decided to hold my friends tightly in my heart, but   39    in my expectations of them, allowing them   40   to grow and to change—with or without me.
21．A．hang         B．place         C．throw          D．give
22．A．send         B．transport          C．carry           D．support
23．A．baskets        B．eyes            C．arms            D．doors
24．A．asking         B．wondering           C．mentioning      D．informing
25．A．remember     B．experience          C．remind                D．grasp
26．A．plan         B．task             C．opportunity      D．challenge
27．A．lived         B．played             C．traveled           D．discussed
28．A．failed              B．finished           C．changed           D．proved
29．A．started         B．hurt             C．paid            D．injured
30．A．why              B．what         C．whether           D．how
31．A．anxiously     B．weakly         C．angrily            D．happily
32．A．tears         B．thoughts          C．unhappiness     D．freedom
33．A．reason         B．means          C．chance         D．direction
34．A．able        B．impossible       C．acceptable        D．doubtful
35．A．nearly             B．hardly             C．finally             D．generally
36．A．covering          B．hiding          C．cheering          D．passing
37．A．miss         B．forget              C．disturb             D．control
38．A．decision       B．mistake         C．suggestion        D．difference
39．A．deeply        B．shortly             C．highly             D．loosely
40．A．time         B．space           C．sense           D．care

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Illegal removal of coral(珊瑚) along Sri Lanka’s coastline increased the amount of destruction on the island by last December’s tsunami, say researchers.
Harindra Fernando, a fluid dynamicist (力学家) at Arizona State University in Tempe, made the connection after a visit to his native Sri Lanka earlier this year．While serving as a scientific expert and translator for a BBC-documentary team, he chatted with locals who said they saw the tsunami turn sideways when it hit coral—which would have made it less powerful than in coral-free areas．Fernando linked this to trucks he had seen last year carrying piles of coral away from the sea.
Using the eyewitness reports, estimates (估算) of wave heights, and a series of divers to check the presence or absence of corals, Fernando and his colleagues produced a map of coral gaps and wave flooding along Sri Lanka’s southwest coast.
The tsunami reached significantly farther inland through the gaps: in one instance, the water traveled 1.5 kilometres long and knocked a passenger train off its tracks, killing 1,700．But only a few kilometers away, where the coral was still undamaged, the wave travelled just 50 metres inland and caused no deaths.
There is a similar phenomenon．In Nicaragua in 1992, a tsunami poured through a break in the coral reef made to let boats through．“Within this passage, water went one kilometre inland,” says Fernando．“But nearby, where the coral was undamaged, there were still beach umbrellas standing.”
In Sri Lanka, coral is illegally mined to provide souvenirs for tourists, or to be used in house paint．Coral harvesters sometimes blow it up with dynamite (炸药) in order to collect fish at the same time．Often, the reefs in the best shape are those in front of hotels, as the hotel owners maintain them for the tourists．Fernando hopes that his findings will encourage the Sri Lankan government to enforce(实施) its laws against coral mining.
57．Harindra Fernando did all the following EXCEPT ________.
A．serving as a translator for a BBC-documentary team
B．helping the Sri Lankan government enforce its laws against coral mining
C．producing a map of coral gaps along Sri Lanka’s southwest coast
D．linking the coral removal with the destruction of Tsunami
58．The main idea of Paragraph 5 is that________.
A．undamaged coral can greatly decrease tsunami damage
B．coral-free area is a danger to passenger trains
C．in general, water travels 30 times farther inland in a coral-free area
D．it is urgent to enforce laws against coral mining
59．Which of the following may NOT be the cause of coral gaps?
A．Boat passages． B．Tourists’ sightseeing．
C．Fish collecting． D．Tourists’ souvenirs.
60．Which of the following would be the best title for the passage?
A．Harindra Fernando, a Great Environment Protector
B．Stop Using Coral as Souvenirs
C．Coral Cried “Help! Help!”
D．Coral Mining Enhanced (加剧) Tsunami Damage

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Country music is one of the most popular kinds of music in the United States today because it is about simple but strong human feelings and events-love, sadness, good times, and bad times. It tells real-life, stories and sounds the way people really talk. As life becomes more complicated(复杂), it is good to hear music about ordinary people.
Country music, sometimes called country-western, comes from two kinds of music. One is the traditional music of the people in the Appalachian Mountains in the eastern Unite States. The other is traditional cowboy music from the west. The singers usually play guitars, and in the 1920s they started using electric guitars. At first city people said country music was low class. It was popular mostly in the South. But during World War II, thousands of Southerners went to the Northeast and Midwest to work in the factories. They took their music with them. Soldiers from the rest of the country went to army camps（军营）in the South. They learned country music. Slowly it became popular all over the country.
Today country music is also popular everywhere in the United States and Canada—in small towns and in New York City, among black and white, and among educated and uneducated people. About 1, 200 radio stations broadcast country music twenty-four hours a day. English stars sing it in British English, and people in other countries sing it in their own languages. The music that started with cowboys and poor southerners is now popular all over the world.
57. It can be learned from the passage that country music comes from_________-
A. the Northeast and Midwest
B. factories and army camps in the South
C. the Appalachian Mountains and the West
D. real-life stories in small towns
58. Before World War II country music was popular mainly in________.
A. the south           B. the north
C. the Midwest        D. the Northeast
59. During World War II many Southerners went to the Northeast and the Mid-west because____.
A. they wanted to take music with them
B. they wanted to make other people like country music
C. they wanted to work in the factories there
D. they wanted to make country music popular
60. Which of the following is NOT true according to the passage?
A. Country music is about human feelings and events.
B. Country music is sung by stars all in English.
C. Country music is popular among city people today.
D. City people didn’t like country music at first.

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