C
What is blood? It is the red liquid which comes out of your finger when you cut it. There are bout thirteen pints(品脫) of blood in a man' s body. He can give a pint of blood at a time to
blood bank for the use of other men who may need it. A healthy body makes up one pint of bloo
quickly.
What does our blood do for us? It takes food to all parts of our bodies and takes waste awa
from them. All the parts of our bodies are made up of cells, and these cells, which are very small
all need food all the time.
The blood is like a stream. The cells take what they need out of the blood stream, as plants an fishes take their food out of water. The blood stream carries food and oxygen which it has taken up our lungs to all the cells in the body.
What makes the blood go on moving round the body in a stream? The heart sends it round.
man' s heart is about the Size of his fist. The heart is a pump. It has rooms in it with doors betwee
them. It pumps blood in and out through these doors by changing the size of the rooms so that th
doors open and shut.
The heart keeps stream of blood going all round the body and back again to itself. Everywhel the blood stream does two things: supplies the cells with food and oxygen and takes away the waste It is as if the blood kept the little fires in the cells burning and took away the ashes.
49. Blood is the_____
A. red liquid which comes from your finger    B. red liquid which we can see
C. red liquid which flows in a man's body     D. red cell
50. The blood in a man' s body__________.
A. makes food all the time
B. takes food to all cells in the body and takes waste away
C. supplies the cells with food and oxygen from them
D. takes waste away from the cells
51. __ makes the blood go on moving round the body in a stream.
A. The heart          B. The lung          C. The cell          D. The pump
52. This article tells us about__________.
A. a stream of blood                        B. the use of the heart
C. a wonderful pump                       D. something about blood
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解


Plants, like animals, are subject to diseases of various kinds.It has been estimated that some 30,000 different diseases attack our economic plants; forty are known to attack corn, and about as many attack wheat.The results of unchecked plant disease are all too obvious in countries which have marginal food supplies.The problem will soon be more widespread as the population of the world increases at its frightening rate.Even in countries which are now amply fed by their agricultural products there could soon be the major crops; the resulting famines(饑荒) could kill millions of people, and the resulting hardship on other millions could cause political upheavals(動(dòng)亂) disastrous to the order of the world.
Some plants have relative immunity to a great many diseases, while others have a susceptibility to them.A blight (萎菌病) may be but a local infection easily controlled; on the other hand it can attack particular plants in a whole region or nation.An example is the blight which killed virtually every chestnut tree in North America.Another is the famous potato blight in Ireland in the last century.As a result of that, it was estimated that one million people died of starvation and related ailments.
Plant pathologists have made remarkable strides in identifying the pathogens of the various diseases.Bacteria may invade a plant through an infestation of insect parasites carrying the pathogen.A plant can also be inoculated by man.Other diseases might be caused by fungus which attacks the plant in the form of a model or smut or rust.Frequently such a primary infection will weaken the plant so that a secondary infection may result form its lack of tolerance.The symptoms(癥狀) shown may cause an error in diagnosis, so that treatment may be directed toward bacteria(細(xì)菌) which could be the result of a susceptibility caused by a primary virus infection.
小題1:How many diseases are known to attack wheat?
A.Around 30000B.Forty
C.Around 29960D.Around 40
小題2:Unchecked plant disease won't result in_______.
A.food shortages in poor country B.food shortages in rich country
C.increase of world populationD.disaster in world politics
小題3:What is the main idea of the second paragraph?
A.Some plants have relative immunity to a great many diseases.
B.Some other plants have a susceptibility to a great many diseases.
C.The tolerance of a particular plant changes as the growing conditions change.
D.A blight can be a national infection.
小題4:According to the passage, some plant diseases can__________.
A.infect people
B.be prevented by inoculation(接種疫苗)
C.be prevented by killing insects
D.be prevented by improving the growing conditions
小題5:Which of the following won’t cause plant disease ?   
A.FungusB.MoldC.SmutD.Rust

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空


第三部分任務(wù)型閱讀(滿分10分)
Romantic novelists rarely fail to include in their writings that special moment when two strangers look into each other's eyes across a crowded room and feel the tingle of desire. Now these writings have now been validated(證實(shí))by science, for experts have discovered that eye-to-eye contact in fact leads to a burst of activity in the reward center of the brain.
Neuroscientists at University College London asked eight female and eight male volunteers to look at photos of the faces of 40 different people who were either looking at the camera or gazing to one side.
While the volunteers looked at the pictures, they were given a scan with functional magnetic resonance imaging(磁性共振成影儀器), which measures increased blood flows to the various parts of the brain and thus provides a "map" of cerebral activity(大腦活動(dòng)).
The volunteers were then asked to rate the attractiveness of each face, and their score was matched against the scan.
The result: when volunteer had direct eye contact with the face, there was an increase of activity in the ventral striatum(腹面紋狀體), a central part of the brain that anticipates reward or pleasure. But if the eyes did not meet, there was no activity in that brain area at all. The activity increase occurred regardless of the gender of the face in direct eye contact.
However, there was a bigger-than-usual increase if the person giving the eye was found to be attractive. Activity in the ventral striatum surged. But if the cute person gazed to one side, the ventral striatum remained dormant, apparently disappointed that the stranger was clearly not interested.
Interestingly, the ventral striatum also perked up if a plug-ugly person gazed to one side, rather than looked at the volunteer right in the eyes.
Origin of the experiment
Romantic novelists like to describe in their writings that two strangers look into each other's eyes across a crowded room and feel the tingle of desire in a special ____71____.
__72__ of the experiment
Investigate whether eye-to-eye contact ____73____ a burst of activity in the reward center of the brain.
 
Procedure of the experiment
◆Ask ____74____ volunteers(8 female and 8 male)to look at photos of the faces of 40 different people who were either looking at the camera or gazing to one side.
◆____75____ blood flows to the various parts of the volunteers’ brain and thus provides a "map" of cerebral activity.
◆Ask the volunteers to rate the attractiveness of all ____76____,
◆____77____ their score against the scan.
 
____78____ of the experiment
◆As long as the eyes meet ____79____, there must be activities in the brain area. On the other hand, there is no activity at all.
◆The activity of the brain is also ___80_____ with the people’s appearance closely.
 

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空

 完形填空(共20小題;每小題1.5分,滿分30分)
閱讀下面短文,從短文后所給各題的四個(gè)選項(xiàng)(A、B、C和D)中,選出可以填入空白處的最佳選項(xiàng)。
Since my family were not going to be helpful, I decided I would look for one job by myself and not tell them about it till I'd got one.               
I had seen an agency advertised in a local newspaper. I rushed out of the   21_   in search of it. I was wildly excited, and as    22_  as if I were going on the stage. Finding the    23_  quite easily, I ran breathlessly through a door which said " Enter without knocking, if you please. "
The simple atmosphere of the office    24_  me. The woman looked carefully at me   25_  through her glasses, and then    26_  me in a low voice. I answered softly. All of a sudden I started to feel rather   27_  . She wondered why I was looking for this sort of   28_  . I felt even more helpless when she told me that it would be   29  to get a job without    30_  . I wondered whether I ought to leave,   31_   the telephone on her desk rang. I heard her say:
“   32_  , I've got someone in the   33_  at this very moment who might    34_   . " She wrote down a   35_   . and held it out to me, saying: "Ring up this lady. She wants a    36   immediately. In fact, you would have to start tomorrow by cooking a dinner for ten people."
"Oh yes, " said I——   37_   having cooked for more than four in my life. I   38_  her again and again, and rushed out to the   39_  telephone box. I collected my thoughts, took a deep breath, and rang the number. I said confidently that I was just what she was looking for.
I spent the next few hours   40_   cook books.
21. A.bed        B.house      C.a(chǎn)gency      D.office
22. A.proud       B.please        C.nervous     D.worried
23. A.family       B.door      C.place        D.stage
24. A.calmed       B.excited       C.frightened    D.disturbed
25. A.a(chǎn)s usual      B.for a while   C.in a minute   D.once again
26. A.a(chǎn)dvised      B.examined     C.informed    D.questioned
27. A.encouraged   B.dissatisfied   C.hopeless     D.pleased
28. A.place        B.job            C.a(chǎn)dvice       D.help
29. A.difficult      B.helpless       C.possible      D.unusual
30. A.a(chǎn)bility       B.experience     C.knowledge   D.study
31. A.  after      B.since       C.until         D.when
32. A. Above all   B.As a matter of fact   C.As a result   D.In spite of that
33. A. family     B.house        C.office        D.restaurant
34. A. hire       B. accept      C.suit          D.offer
35. A. letter      B.name    C.note        D.number
36. A. cook       B.help      C.teacher      D.secretary
37. A. almost      B.never        C.nearly       D.really
38. A. answered    B.promised     C.thanked     D.told
39. A.  outside    B. local       C.closest       D.nearest
40. A. burrowing   B.buying         C.reading      D.lending

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

There is no doubt that adults, and even highly educated adults, vary greatly in the speed and efficiency of their reading. Some proceed very lowly throughout; others dash along too quickly and then have to regress. Poor readers in particular may lack the ability to vary their manner of reading according to the type of reading matter and to their intentions in reading it. A good reader can move at great speed through the text of a novel or similar light reading matter. He may be able to skim a page, picking up a word or two here and there, and gain a general idea of what the text is about without really reading it. In reading more difficult material, with the intention of taking in the whole of it, he will proceed more slowly, but even then he will vary his pace, concentrating on the key words and passages, perhaps re-reading them several times and pass more quickly over the remainder. A less efficient reader tends to maintain the same speed whatever the material he reads. Consequently, even light reading matter gives him little pleasure because he reads so slowly. But this pace may be too fast for really difficult material which requires special concentration at difficult points.
A type of reading which necessitates(需要) careful attention to detail is proofreading, in which the reader, in order to detect misprints in a sample print, has to notice not so much the meaning of what he reads as the exact shape and order of letters and words in the text. This is extremely difficult for most people, since they are accustomed to overlooking such details. In fact, considerable practice is required to practise this task efficiently and it can be done only by reading very slowly, and by paying comparatively little attention to the general meaning of the text.
68.This article is mainly concerned with ________.
A.the ability to read fast      
B.difference in the speed and efficiency of reading
C.different reading skills      
D.the reading speed of highly educated adults
69.According to the article, there is a difference in reading speed ________.
A.a(chǎn)mong adult readers
B.a(chǎn)mong young educated people
C.a(chǎn)mong readers who have different experiences
D.between the poorly educated and the highly educated
70.The underlined word "regress" can be best replaced by "________".
A.regret         B.stop   C.move slowly       D.go back
71.The author believes a good reader should ________.
A.a(chǎn)lways read at great speed      
B.read carefully and catch every detail
C.a(chǎn)lways review the text he has read 
D.change his speed according to the type of text

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


Global surface temperatures have increased 0.6—1.2 degrees since the late 19th century. The 20th century’s 10 warmest years all happened within the last 15 years. Of these,1998 was the warmest year on record. The snow covering the Northern Hemisphere(半球)and floating ice in the Arctic Ocean decreased. Globally, sea level has risen 4—10 inches over the past century. World-wide amount of rain and snow over land has increased by about one percent. The number of major rainfall events has increased throughout much of the United States.
Increasing concentrations(集中)of greenhouse gases are likely to make climate change faster. Scientists expect that the average global surface temperature could rise 1.6—6.3 degrees by 2100,and the climate in different areas could change differently. Evaporation(蒸發(fā))will increase as the climate warms, which will increase average global amount of rain and snow. Soil moisture(潮濕)is likely to decrease in many areas, and strong rainstorms are likely to become more frequent.Sea level is likely to rise two feet along most of the U.S coast.
Calculations of climate change for certain areas are much less able to be trusted than global ones, and it is unclear whether the climate in different areas will become more variable(變化無常的).
64.Which of the following statements is not mentioned in the first paragraph?
A.The snow has been seen covering the Southern Hemisphere .
B.More and more major rainfall events have happened to the U.S.
C.On the whole earth, sea level has risen 4—10 inches.
D.The amount of the rain in the world has increased by about 1%.
65.According to scientists, the reason why the climate becomes warm is that________.
A.the snow covering Northern Hemisphere has decreased
B.evaporation has increased in the recent years
C.greenhouse gases concentrate increasingly
D.the floating ice in the Arctic Ocean has decreased
66.It is because______ that strong rainstorms become more frequent.
A.a(chǎn)verage global little of rain and snow increases
B.the climate becomes warm
C.soil moisture decreases
D.sea level rises two feet

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


Parents often believe that they have a good relationship with their teenagers (青少年). But last summer, Joanna and Henry noticed a change in their older son: suddenly he seemed to be talking far more to his friends than to his parents . “The door to his room is always shut.” Joanna noted.
Tina and Mark noticed similar changes in their 14-year-old daughter. “She used to cuddle up (蜷伏)with me on the sofa and talk ,” said Mark . “Now we joke that she does this only when she wants something. Sometimes she wants to be treated like a little girl and sometimes like a young lady. The problem is figuring out which time is which.”
Before age 11, children like to tell their parents what’s on their minds. “In fact, parents are first on the list.” said Michael Riera, author of Uncommon Sense for Parents with Teenagers. “This completely changes during the teen years.” Riera explained. “They talk to their friends first, then maybe their teachers, and their parents last.”
Parents who know what’s going on in their teenagers’ lives are in the best position to help them. To break down the wall of silence, parents should create chances to understand what their children want to say, and try to find ways to talk and write to them. And they must give their children a mental break, for children also need freedom, though young. Another thing parents should remember is that to be a friend, not a manager, with their children is a better way to know them.
69. “The door to his room is always shut” suggests that the son        .
A. is always busy with his studies           B. doesn’t want to be disturbed
C. keeps himself away from his parents       D. begins to dislike his parents
70. What troubles Tina and Mark most is that        .
A. their daughter isn’t as lovely as before   B. they can’t read their daughter’s mind exactly
C. they don’t know what to say to their daughter
D. their daughter talks with them only when she needs help
71. Which of the following best explains “the wall of silence” in the last paragraph?
A. Teenagers talk a lot with their friends.      
B. Teenagers do not want to understand their parents.
C. Teenagers do not talk much with their parents.
D. Teenagers talk little about their own lives.
72. What can be learned from the passage?
A. Parents are unhappy with their growing children.
B. Parents have suitable ways to talk with their teenagers.
C. Parents should be patient with their silent teenagers.
D. Parents should try to understand their teenagers.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


E
Is early childhood education really necessary? Early childhood education primarily focuses on learning through playing to develop the child’s physical, sensory, communicational and social development.Early childhood education has become a concern of the government, who pushes poor children to be formally trained before they are old enough for Kindergarten.
There are good reasons for the government to push early childhood education.Studies have shown that orphaned children who did not receive good care and education become developmentally delayed causing failure in school, and even in life.Further studies show that poor children who take part in Head Start programs are more prepared for school, less likely to end up in   
Special Education classes, and are less likely to receive public help or go to jail.
There are also negative parts to putting a child in formal education programs too early.Time Magazine online explains that “the younger the child the less his chances of catching up with first-grade work.” I have personally witnessed many children of my generation who went to Head Start programs become frustrated and bored with school before they finished high school.Yet parents have been sure that the earlier the child starts school, the better off he or she is, so they push to start children earlier.
Actually while early formal education of poor children does show great gains in the early elementary years, studies also show that this head start is really a “false start”, as the gains are lost in middle and high school years.It seems that environment is a bigger factor on life’s success than early education.Head Start programs have not achieved its original goal in closing the achievement gap in poor and middle school children.Perhaps it is time to find other ways to close that gap.
71.The purpose of the government valuing the early childhood education is ________.
A.to develop the children’s communication
A.to give orphaned children good care and education
C.to get the children prepared for the kindergarten
D.to train the children formally and regularly
72.According to the studies, which of the following is True?
A.Children with good early education may have a rich life.
B.The orphaned children are usually unhappy in their life.
C.Children without early education can do well at school.
D.Head Start programs are helpful to the poor children.
73.“the younger the child the less his chances of catching up with first-grade work.” suggests that _________.
A.the early childhood education is helpless to the child’s grade
B.it is good for the young children to receive early education
C.the early education can help the children follow the grade
D.the younger the children are, the cleverer they will be
74 The author’s attitude toward the early childhood education is _________.
A.puzzling       B.objective      C.indifferent    D.a(chǎn)pproving
75.The main idea of the last passage is that __________.
A.the early childhood education is very necessary
B.Head Start programs have helped the children a lot
C.environment is the most important to life’s success
D.better ways should be found to help the poor children

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

  Language is always changing. In a society where life continues year after year with few changes, the language does not change, either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.
 There are several major language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language About 3 percent of the people in the world speak languages that are not in these major families.
60. The early language had ______.
A. a lot of problems                                      B. words and easy grammar
C. words but no grammar                                    D. grammar but not many words
61. In the next few hundred years we can expect language to ______.
A. stay exactly the same                             B. change a great deal
C. change only a little                                  D. add more words and drop some grammar
62. What this article shows is that ______.
A. languages change fast             B. languages really don’t want to change
C. language changes with changes of society     D. Spanish and English change
63. From this article we can see that ______.
A. language can change very slowly or very quickly
B. if we don’t change, then our language won’t change, either
C. we should give our plants new names
D. English and Spanish are the only languages that have changes

查看答案和解析>>

同步練習(xí)冊(cè)答案