There is a joke among flu researchers: “If you've seen one flu season, you've seen one flu season.” The joke is about the unpredictable nature of the flu virus. Every year it looks different, and every strain (類(lèi)型) follows its own pattern — it's the reason why new strains like H1N1 are extremely difficult to predict.
Dr. Michael Osterholm is a former adviser to the U.S. Department of Health and Human Services. “I know less about influenza today than I did 10 years ago,” he says in a joking way. “Every stone we've turned over, we get more questions.”
The flu rectums every season and the world experiences terrible pandemics (全國(guó)或全世界范圍流行的疾病), but researchers still do not understand why some strains infect people and others do not; they are not entirely sure about how the flu is transmitted; nor do they understand why some patients become seriously ill while others develop mild symptoms (癥狀). As a result, when a new strain shows up — like H1N1 — they often have little information to fall back on, and the lessons of previous pandemics are only somewhat helpful. While researchers are still putting together a complete picture of H1N1, for example, its most striking difference with the seasonal flu is that the elder1y are not the most vulnerable (易受攻擊的) population.
Influenza's unpredictable nature makes it a moving target for researchers, says researcher Allison Aiello at the University of Michigan. “Even if we had complete seasonal flu data from the past, it wouldn't be much helpful for a new strain of influenza,” she explains.
Whi1e researchers are frustrated by the holes in their knowledge, they say, however, that the pub1ic--health community is generally doing a very good job responding to H1N1 with seasonal flu data that do exist. Studying influenza, says Osterholm, is “l(fā)ike looking through the windows of a house you can't get into because the door is locked.” Gathering the data researchers do have is like “l(fā)ooking through the windows to get a pretty good picture of what the inside looks like.”
One thing researchers do know for sure: the best way for people to protect against H1N1 is to get the vaccine once it becomes available to them.
【小題1】What do we learn about H1N1 from the passage?

A．In fact it is not a kind of influenza virus.
B．It is quite possible to predict it in theory.
C．Old people are more likely to contract it than kids.
D．Receiving vaccines will be effective to protect against it.
【小題2】 The underlined phrase “fall back on” in Para. 3 probably means      .
A．rely onB．pass onC．col1ect D．exchange
【小題3】 What do we know about previous seasonal flu data?
A．It is useless to study them.
B．It is still necessary to study them.
C．They are misleading most of the time.
D．They are much more helpful than expected.
【小題4】Which of the following could be the best title for the passage?
A．Outbreaks of the fluB．Symptoms of the flu
C．Mysteries of the fluD．Risks of the flu


【小題1】D
【小題2】A
【小題3】B
【小題4】C

解析

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：2010年陜西省延安市實(shí)驗(yàn)中學(xué)高一下學(xué)期期末考試試題（英語(yǔ)） 題型：完型填空


第四節(jié)完形填空（共20小題，每小題1分，滿分20分）
Once upon a time, there was an island where all the feelings lived: Happiness, Sadness, Knowledge, and all of the others, including    26  . One day it was announced to the feelings that the island would   27  , so all constructed boats and left, except Love.
Love was the   28   one who stayed until the last possible moment. When the island had almost sunk, Love decided to ask for   29  .
Richness was   30   Love in a grand boat. Love said, “Richness, can you take me with you?” Richness answered, “No, I can’t. There is a lot of   31   and silver in my boat. There is no  32   here for you.” Love decided to ask Vanity who was   33   passing by in a beautiful vessel. “Vanity, please help me!” “I can’t help you, Love. You are all wet and might   34   my boat,” Vanity answered. Just then Sadness was   35  , so Love asked, “Sadness, let me go with you.” “Oh…Love, I am so   36   that I need to be by myself!” Happiness passed by Love, too, but she was so   37   that she did not even   38   Love when Love called her.
Suddenly, there was a voice, “Come, Love, I will   39   you.” It was a(n)   40  . So blessed and overjoyed, Love even forgot to ask the elder   41   they were going. When they arrived at dry   42  , the elder went her own way.
43   how much was owed the elder, Love asked Knowledge, another elder, “Who helped me?” “It was   44  ,” Knowledge answered. “Time?” asked Love. “But why did Time help me?” Knowledge   45   with deep wisdom and answered, “Because only Time is able to understand how valuable Love is!”
26. A. Vanity             B. Richness         C. Time              D. Love
27. A. float              B. sink             C. fly                 D. fall
28. A. very              B. only              C. likely            D. first
29. A. advice            B. help                   C. money           D. time
30. A. passing by            B. looking at       C. facing to        D. thinking of
31. A. water                B. food          C. gold           D. value
32. A. wealth               B. place            C. need              D. chance
33. A. still            B. also             C. even          D. just
34. A. dirty             B. damage        C. turn           D. steal
35. A. far               B. near            C. distant          D. closed
36. A. joyful            B. surprised       C. sad             D. hurried 
37. A. happy           B. angry                  C. amazed       D. proud
38. A. saw              B. notice           C. catch             D. hear
39. A. take             B. fetch            C. ask              D. carry
40. A. adviser         B. elder            C. younger                D. helper
41. A. how            B. why                   C. when            D. where
42. A. shore            B. grass           C. land            D. room
43. A. Realizing        B. Believing      C. Understanding  D. Questioning
44. A. Kindness         B. Time           C. Power          D. Strength
45. A. cried            B. shouted        C. smiled           D. flushed

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2011屆湖北黃岡中學(xué)高三最后一次適應(yīng)性考試英語(yǔ)試卷 題型：閱讀理解

There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to give children something to do.
In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are strictly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers.This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world.
What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of skill, mechanics, and technology. It is the universality of toys with regard to their development in all parts of the world and their insistence to the present that is amazing. In Egypt, the US, China,Japan and among the Arctic peoples, generally the same kinds of toys appeared. Variations depended on local customs and ways of life because toys reflect their surroundings.Nearly every civilization had dolls, little weapons, toy soldiers, tiny animals and vehicles.
Because toys can be generally regarded as a kind of art form, they have not been affected by technological quick development that characterize inventions for adult use. The progress from the wheel to the ox-cart to the automobile is a direct line of ahievement. The progress from a rattle(撥浪鼓) used by a baby in 3000 BC to one used by a baby today, however, is not characterized by inventiveness. Each rattle is the product of the artistic tastes of times and subject to the limtations of available materials.
【小題1】. The reason why the toys most boys play with are different from those that girls play with is that_________.

A．their social roles are strictly determined
B．most boys would like to follow their fathers’ professions
C．boys like to play with their fathers while girls with their mothers
D．they like challenging activities
【小題2】. Which of the following is the author’s view on the historical development of toys？
A．The making skills in toys has remained essentially unchanged.
B．Toys have remained basically the same all through the centuries.
C．The toy industry has witnessed great improvement in technology in recent years.
D．Toys are playing an increasingly important role in shaping a child’s character.
【小題3】. Regarded as a kind of art form, toys________.
A．follow a direct line of achievement
B．a(chǎn)lso appeal greatly to adults
C．a(chǎn)re not characterized by technological progress
D．reflect the pace of social progress
【小題4】. The author uses the example of a rattle to show that________.
A．in toy-making there is a continuity in the use of materials
B．even the simplest toys can reflect the progress of technology
C．it often takes a long time to introduce new technology into toy-making
D．even a simple toy can mirror the artistic tastes of the time

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2010-2011學(xué)年湖南省長(zhǎng)郡中學(xué)高二學(xué)業(yè)水平二�？荚囉⒄Z(yǔ)試卷 題型：閱讀理解

Most British telephone cards are just plain green, but card collecting is becoming a popular hobby in Britain and collectors even have their own magazine, International Telephone Cards. One reason for their interest is that cards from around the world come in a wide variety of different and often very attractive designs. There are 100, 000 different cards in Japan alone, and there you can put your own design onto a blank card simply by using a photograph or a business card.
　　The first telephone cards, produced in 1976, were Italian. Five years later the first British card appeared, and now you can buy cards in more than a hundred countries. People usually start collecting cards because they are attractive, small and light , and they do not need much space. It is also a cheap hobby for beginners, although for some people it becomes a serious business. In Paris, for example, there is a market where you can buy only telephone cards, and some French cards cost up to 4, 000 pounds. The first Japanese card has a value of about 28, 000 pounds. Most people only see cards with prices like these in their collectors magazine.
【小題1】The text is mainly about ________ .

A．the history of phone cardsB．phone card collecting as a hobby
C．reason for phone card collecting　　D．the great variety of phone cards
【小題2】When did people in Britain begin to use phone cards?
A．In 1971.　　 B．In 1975.　　C．In 1976.D．In 1981.
【小題3】The main reason for most people to collect phone cards is that ________ .
A．they find the cards beautiful and easy to keep
B．they like to have something from different countries
C．they want to make money with cards
D．they think the cards are convenient to use
【小題4】The writer mentions a market in Paris in order to show that ________
A．card collecting is popular among young people
B．French and Japanese cards are the most valuable
C．people can make money out of card collecting
D．card collectors magazines are very useful

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2012屆廣東省廣州市禺山高級(jí)中學(xué)高三第一次月考英語(yǔ)試卷 題型：閱讀理解

Do you want to live with a strong sense of peacefulness, happiness, goodness, and self-respect? The collection of happiness actions broadly categorized(把…歸類(lèi)) as "honor" help you create this life of good feelings.
Here's an example to show how honorable actions create happiness.
Say a store clerk fails to charge us for an item. If we keep silent, and profit from the clerk's mistake, we would drive home with a sense of sneaky(卑鄙的) excitement. Later we might tell our family or friends about our good fortune. On the other hand, if we tell the clerk about the uncharged item, the clerk would be grateful and thank us for our honesty. We would leave the store with a quiet sense of honor that we might never share with another soul.
Then, what is it to do with our sense of happiness?
In the first case, where we don't tell the clerk, a couple of things would happen. Deep down inside we would know ourselves as a type of thief. In the process, we would lose some peace of mind and self-respect. We would also demonstrate(演示) that we cannot be trusted, since we advertise our dishonor by telling our family and friends. We damage our own reputations by telling others. In contrast, bringing the error to the clerk's attention causes different things to happen. Immediately the clerk knows us to be honorable. Upon leaving the store, we feel honorable and our self-respect is increased.  Whenever we take honorable action we gain the deep internal rewards of goodness and a sense of nobility(高尚).
There is a beautiful positive cycle that is created by living a life of honorable actions. Honorable thoughts lead to honorable actions. Honorable actions lead us to a happier existence. And it's easy to think and act honorably again when we're happy. While the positive cycle can be difficult to start, once it's started, it's easy to continue. Keeping on doing good deeds brings us peace of mind, which is important for our happiness.
【小題1】According to the passage, the positive action in the example contributes to our_______.

A．self-respect B．financial rewardsC．a(chǎn)dvertising abilityD．friendly relationship
【小題2】The author thinks that keeping silent about the uncharged item is equal to_______.
A．lyingB．stealingC．cheatingD．a(chǎn)dvertising
【小題3】The underlined phrase "bringing the error to the clerk's attention" means_______.
A．telling the truth to the clerkB．offering advice to the clerk
C．a(chǎn)sking the clerk to be more attentiveD．reminding the clerk of the charged item
【小題4】How will we feel if we let the clerk know her mistake?
A．We'll be very excited.B．We'll feel unfortunate.
C．We'll have a sense of honor.D．We'll feel sorry for the clerk.
【小題5】Which of the following can be the best title of this passage?
A．How to Live TruthfullyB．Importance of Peacefulness
C．Ways of Gaining Self-respectD．Happiness through Honorable Actions

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2012屆安徽省安慶一中高三第三次模擬考試英語(yǔ)試卷（帶解析） 題型：閱讀理解

A farm planted levels or floors is called a vertical（垂直的）farm. A skyscraper type building can house a vertical farm. Since the garden is built upwards，rather than outwards，it requires much less space than a conventional farm.
The world is quickly running out of room for conventional farming. Vertical farms could be a key to this situation. An 18­story vertical farm could feed as many as 50,000 people，all in an area which is the size of the average city block. Vertical farms in the city could cut down on transportation costs as well. Think about the amount of fuel it takes to transport food from farmland to city. The resources saved would be surprising. Besides saving travel time，food would be delivered in fresher condition and with less damage.
There is a growing concern about the use of pesticides(殺蟲(chóng)劑) in agriculture today. But the vertical farm would be a greenhouse type environment, avoiding the need for a large number of pesticides. Vertical farms can be built in a contained space，therefore they are an excellent solution for living well in an environment far different from our own. Hydroponics(水耕法) could be a big part of vertical gardening. This would reduce the amount of soil needed to grow food. Of course，not all food does well with this type of planting，but there are many crops that actually seem to do better.
In some climates，a lack of sunlight creates a short growing season. The solar power option may not work as well here. The addition of grow lights would make it possible to grow crops in vertical gardens in these areas .In other words，we could grow crops in areas where we never could before.
Vertical farms may just be a concept for now，but they are a concept that will solve many of our problems in the future.
【小題1】According to the passage, a vertical farm________.

A．is mainly built outwards
B．is dependent on solar power
C．is planted on levels upwards
D．is only an environmental friendly farm
【小題2】Compared to the conventional farm, the vertical farm can________.
A．depend far less on sunlight
B．greatly increase the use of soil
C．help to protect the limited gardens
D．reduce the use of harmful pesticides
【小題3】It can be learned from the passage that vertical farms________.
A．have been put into use
B．only use hydroponics to grow food
C．need less room than conventional farms
D．may increase the transportation costs
【小題4】What would be the best title for the passage?
A．Vertical farms for our future
B．Ways to deal with future problems
C．Vertical farms and green skyscrapers
D．Making Full Use of Our Limited Land

查看答案和解析>>

同步練習(xí)冊(cè)答案