Light travels at a speed which is about a million times faster than the speed of  sound. You can get some idea of this difference by watching the start of a race. If    you stand some distance away from the starter, you can see smoke from his gun      before the sound reaches your ears.
This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light   rays left the moon 1.3 seconds before they reached you. The nearest star is so far  away that the light that you can see from it tonight started to travel towards you    four years ago at a speed of nearly 2 million km. per minute. In some cases, the    light from one of tonight’s stars had started on its journey to you before you were born.
Thus, if we want to be honest, we can’t say, “The stars are shining tonight.” We   have to say instead, “The stars look pretty. They were shining four years ago, but    their light has only just reached the earth.”
小題1: Light speed is ______ sound speed
A．a(chǎn)s fast asB．a(chǎn) million times slower than
C．a(chǎn)bout millions of times faster thanD．a(chǎn)bout a million times faster than
小題2:If you stand 200 meters away from a man who is firing a gun to start a race, you will find out that ______.
A．you can hear the sound before you see the smoke
B．the sound does not travel as fast as light
C．the sound will reach you before the man fires
D．sound travels about a million times faster than light
小題3:Sunlight obviously (明顯地) ______ than the light of the moon
A．has to travel a greater distanceB．moves less quickly
C．travels much more quicklyD．is less powerful(有力的)
小題4:The scientific way of saying "The stars are shining tonight" should be ______.
A．the stars have been shining all the time
B．the stars seen tonight will shine four years later
C．the stars were shining long ago but seen tonight
D．the starlight seen today could be seen four years ago

小題1:D
小題2:B
小題3:A
小題4:C

小題1:D 事實細節(jié)題。由第1段第1句可知。
小題2:B 推理判斷題。由第1段最后一句推出。
小題3: A 推理判斷題。由第2段的第2句(太陽光到達地球需要8分鐘) 和第3句(月光到達地球僅需1.3秒) 可推出(太陽光走過的距離明顯遠于月光)。
小題4:C 推理判斷題。由最后一段的最后一句They were shining four years ago, but their light has only just reached the earth可推出。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：完形填空

In America,where labor costs are so high, do-it-yourself is a way of life.Many people  36 their own car,build their own garages,even rebuild their own  37 .Soon they may also be writing their own books.In Hollywood there is a company  38 publishes(出版) Children’s books  39  the help of computers.Although other book  40  also publish that way,this particular company is very  41  .It “personalizes”（使個性化）the book by having the computer make the reader the leading character in the story.Here is  42  they do it.Let us say your child  43  Jenny.She lives on Oak Drive in St. Louis,has a dog named Spot,a cat named Tabby,and three playmates  44  names are Betty,Sandy ,and Jody.The computer uses this  45 to fill out a story that has  46 been prepared and illustrated（發(fā)行）.The story is then printed（印刷） with standard equipment  47  a hard-cover book.A child who  48  such a book might say,”This book is about me”;the company therefore calls  49  the Me-book Publishing Company”.
Children like the Me-books because they like to see their own names in print and 50  of their friends and their pets.  51  more important ,”personalization” has been  52  to be important tool（工具） in   __53  enthusiasm（熱情） for reading.So Me-books are helping   54  to learn how to read,   55  appealing to（吸引） that natural desire to see his own name in print.
小題1:
A．drive B．buyC．repairD．notice
小題2:
A．housesB．busesC．TV setsD．computers
小題3:
A．whereB．不填C．thatD．what
小題4:
A．underB．withC．inD．by
小題5:
A．stores B．librariesC．sellersD．companies
小題6:
A．commonB．importantC．unusualD．ordinary
小題7:
A．howB．whyC．whatD．where
小題8:
A．namesB．to be named C．namingD．is named
小題9:
A．whoB．who’sC．whoseD．that
小題10:
A．newsB．information C．condition D．direction
小題11:
A．a(chǎn)lreadyB．reallyC．carefully D．fully
小題12:
A．a(chǎn)sB．thatC．likeD．such
小題13:
A．givesB．borrowsC．looks for D．receives
小題14:
A．themB．itselfC．yourselfD．it
小題15:
A．thatB．whatC．whichD．those
小題16:
A．ButB．AndC．SoD．Therefore
小題17:
A．foundedB．invented C．foundD．heard of
小題18:
A．developing B．workingC．seeingD．improving
小題19:
A．a(chǎn) boyB．a(chǎn) girlC．a(chǎn) studentD．a(chǎn) child
小題20:
A．byB．forC．withD．a(chǎn)bout

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural   36  seemed to be unlimited.
Today things are   37  . The world has become too   38  . We are   39  our natural resources too quickly, and at the same time we are   40  our environment with dangerous chemicals. If we   41  to do this, human life on earth will not   42 .
People realize today that if too many   43  are taken from the sea, there will soon be none left. Yet, with modern fishing   44  , more and more fish are caught.
We know that if too many trees are cut down,   45  will disappear and nothing will  46  on the land. Yet, we continue to use bigger and more powerful machines to   47  more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die.   48  , in most countries waste products are still put into rivers or into the sea, and there are few laws to   49  this.
We also know that if the   50  of the world continues to rise at the present rate, in a few years, there won't be enough food. What can we do to solve the   51  ? If we eat more vegetables and less   52  , there will be more food available for everyone. Land that is used to grow crops feeds five times more people than land where animals are kept.
Our natural resources will   53   longer if we learn to recycle them. The world population will not   54  so quickly if people use modern methods of birth control.
Finally, if we   55  people to think about the problems we shall have a better and cleaner planet in the future.
小題1:
A．resourcesB．sourcesC．materialsD．matter
小題2:
A．commonB．the sameC．changeableD．different
小題3:
A．crowdedB．pollutedC．dirtyD．busy
小題4:
A．producingB．using upC．reducingD．making
小題5:
A．protectingB．savingC．pollutingD．fighting
小題6:
A．tryB．continueC．stopD．have
小題7:
A．liveB．lastC．continueD．survive
小題8:
A．fishB．seagullsC．crocodilesD．frogs
小題9:
A．polesB．boatsC．methodsD．ideas
小題10:
A．mountainsB．the seaC．cropsD．forests
小題11:
A．growB．plantC．saveD．cut down
小題12:
A．plantB．cut downC．saveD．burn down
小題13:
A．ThusB．HoweverC．Generally speakingD．Therefore
小題14:
A．encourageB．neglectC．stopD．wake up
小題15:
A．productionB．pollutionC．populationD．revolution
小題16:
A．pollutionB．environmentC．questionsD．problems
小題17:
A．fruitB．meatC．fishD．grain
小題18:
A．useB．stayC．keepD．last
小題19:
A．raiseB．riseC．runD．grow
小題20:
A．forceB．helpC．educateD．show

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Don’t you think your schoolbag is too heavy to bear? The e-schoolbag will free you from the weight.
It is said that e-schoolbags are going to be brought into use in Chinese middle schools soon. An experiment with several hundred e-schoolbags will begin in seven cities: Beijing, Shanghai, Dalian, Shenzhen, Chongqing, Taiyuan and Shijiazhuang. And the e-schoolbags are going to cover all over China if the experiment proves to be successful. In fact, the e-schoolbag should perhaps be called an e-notebook. It is a small hand-held computer for school students.
Heavy schoolbags have long been a serious problem for school students. The average schoolbag of middle school students weighs up to 5 kilos. But the e-schoolbag will change everything. It is much lighter than a usual schoolbag, weighing under 1 kilo.
Also, it is no bigger than a usual book, but it can still hold all the things for study, such as a textbook, a notebook and exercise book. They could be made into chips that are as small as a stamp. The students can read the text page by page on the screen. They can still take notes using a special electronic pen. If they want to know the meaning or the pronunciation of a new word, or even e-mail their teachers, it’s just a press of a button.
In some foreign countries, it is becoming common. But it is hard to tell when people will receive this new form of study. Some say that e-textbooks can be easily broken, some say that it is not good to students’ eyesight to look at the screen for long.  But only time will tell.
小題1:The e-schoolbag has many functions EXCEPT ________.
A．It can pronounce the words.
B．It can send e-mail.
C．It can be used as a dictionary.
D．It can phone somebody.
小題2:According to the passage, the e-schoolbag ­­­________.
A．is not heavy as before but still large
B．is used as an experiment in Tianjin
C．is made of metal
D．is going to cover China if it proves to be successful
小題3:Which of the following statement is TRUE?
A．All the students in China will be required to use this new schoolbag soon.
B．All the people think highly of e-textbooks.
C．E-notebooks are very convenient to students.
D．We will not make notes because the e-notebook can make all by itself.
小題4:The best title for the passage should be ________.
A．An Experiment In China
B．Please Change Your Schoolbag
C．A New Invention, A New Schoolbag
D．Chips

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Joker found one of the biggest diamonds in the world right in his own back yard. He sold the stone to a diamond dealer for over three hundred thousand dollars. In New York, the diamond was resold---this time for almost eight hundred thousand dollars. The true value of a diamond is never known until it has been cut. Once cut successfully, its value can increase a thousand times. It's easy to understand why the owner of Joker's diamond went to the best diamond cutter he knew, Kaplan. The cutter studied the diamond for twelve whole months.
When he felt he was ready to start work, he discovered a flaw (瑕疵) . He had to begin his calculations all over again, or he might have made the stone useless. Six months passed, and Kaplan finally said to the owner, “I am ready to start my work. There will be one excellent diamond that will be comparable one excellent diamond of first-class quality (質(zhì)量)  " Kaplan waited a few more days until he felt he was in the best physical and mental (精神的) condition(條件) possible. He picked up his tools (工具) and held his breath as he made the diamond exactly as he promised.
小題1:Joker found one of the biggest diamonds in the world_________.
A．in a minuteB．a(chǎn)t the foot of a big mountain
C．in his own back yardD．in a garage (汽車庫)
小題2:A diamond dealer is a person ___________.
A．in the diamond businessB．who stole diamonds
C．who cuts diamondsD．who sells diamonds
小題3:When the diamond was resold,____________.
A．the dealer lost a lot of money
B．Joker made some more money
C．the dealer got 800, 000 dollars
D．Kaplan got 800,000 dollars
小題4:The owner of the diamond thought that if the diamond was cut successfully it might be worth_________.
A．$ 300, 000B．$ 500,000
C．$ 300, 000D．$ 800,000,000
小題5:Kaplan studied the diamond for____________.
A．more than one and a half years
B．more than half a year
C．over eight months
D．more than nineteen months

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Mobile phones are an important business tool for farmers in rural areas．But they also put a valuable educational tool in their hands．
The University of Illinois in the United States has a project called SAWBO—Scientific Animations Without Borders．It produces educational videos that can be downloaded to cell phones．The goal is to help people in developing countries improve their lives．
One video shows farmers how to make a natural insecticide from neem seeds to prevent insect damage to crops．The process starts with sorting and drying the neem fruits．Then let the fruit dry in the sun for about three or four days, until they become brown．Using a mortar（碾槌） and stick, the fruits are slightly pounded to remove the shells from the fruits without breaking the seed inside．
The videos use computer animation（動畫）．Some of the animated characters are a little funny looking-like a farmer with a long nose．But the subjects are serious, including a health video on preventing cholera（霍亂）．Team member Francisco Seufferheld says the information in the videos is meant to be quickly understood．He says, “The information is digested in such a way that in two minutes, we can transmit a complex idea．”
The researchers tested the seven-minute video on seven mobile phones．They wanted to see if people would share the video using Bluetooth wireless technology．With Bluetooth, files can be passed to a nearby phone even if neither phone is connected to the internet．As a result, in one month, the video had spread to one hundred eighteen people in fifty different villages．" This is just incredible impact," said Francisco Seufferheld．
The team has made a few videos so far．These are available in a total of eighty languages, dialects and accents．Professor Barry Pittendrigh says there are plans for more videos later this year．
小題1:What is the text mainly about?
A．A best-selling mobile phone
B．A valuable educational project for farmers
C．United States support for developing countries
D．A new type of scientist –farmer relationship
小題2:The SAWBO program is introduced in order to ____．
A．raise farmers’ standard of living
B．do some research on mobile phones
C．develop farmers’ practical skills
D．help farmers prevent insect damage to crops
小題3:The biggest advantage of the program is that it______．
A．includes health video on preventing cholera
B．can be passed to farmers using Bluetooth technology
C．can be used to sort and dry the neem fruits
D．is easy for farmers to understand
小題4:Which of the following words can best take the place of the word “ pound” in the 3rd paragraph?
A．movedB．beatC．pickedD．cut

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

For many parents, raising a teenager is like fighting a long war, but years go by without any clear winner. Like a border conflict（沖突）between neighboring countries, the parent-teen war is about boundaries: Where is the line between what I control and what you do?
Both sides want peace, but neither feels it has any power to stop the conflict. In part，this is because neither is willing to admit any responsibility for starting it. From the parents’ point of view, the only cause of their fight is their adolescents’ （青少年）complete unreasonableness. And of course, the teens see it in exactly the same way, except oppositely. Both feel trapped.
In this article, I’ll describe three no-win situations that commonly arise between teens and parents and then suggest some ways out of the trap. The first no-win situation is quarrel on unimportant things. Examples include the color of the teen’s hair, the cleanness of the bedroom, the preferred style of clothing, the child’s failure to eat a good breakfast before school, or his tendency to sleep until noon on the weekends. Second, blaming. The goal of a blaming battle is to make the other admit that his bad attitude is the reason why everything goes wrong. Third, needing to be right. It doesn’t matter what the topic is—politics, the laws of physics, or the proper way to break an egg—the point of these arguments is to prove that you are right and the other person is wrong，for both wish to be considered an authority—someone who actually knows something—and therefore to command respect. Unfortunately, as long as parents and teens continue to assume that they know more than the other, they’ll continue to fight these battles forever and never make any real progress.
小題1:Why does the author compare the parent teen war to a border conflict?
A．Both can continue for generations.
B．Both are about where to draw the line.
C．Neither has any clear winner.
D．Neither can be put to an end.
小題2:What does the underlined part in Paragraph 2 mean?
A．The teens blame their parents for starting the conflict.
B．The teens agree with their parents on the cause of the conflict.
C．The teens accuse their parents of misleading them.
D．The teens tend to have a full understanding of their parents.
小題3:Parents and teens want to be right because they want to__________.  
A．give orders to the otherB．know more than the other
C．gain respect from the otherD．get the other to behave properly
小題4:What will the author most probably discuss in the paragraph that follows?
A．Causes for the parent-teen conflicts
B．Examples of the parent-teen war
C．Solutions for the parent-teen problems
D．Future of the parent-teen relationship

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Roughly speaking, teachers in traditional education may feel that students are too young to know much about the world, and have to be told what to do most of the time. By contrast, open education offers teachers quite different feelings. Students are expected to be responsible for their own education—to discover subjects by themselves instead of being made to study them. This way of teaching allows the students to grow independently and to develop their own interests in many subjects. Some students who do badly in a traditional classroom will be happier in an open classroom and enjoy learning. They will not have to worry about grades or rules at all.
However, many students won’t do well in an open classroom. For these students, they will do little in school if there are too few rules. They will not make good use of open education, which is so different from traditional class, because they may have a problem getting used to making so many choices on their own. For them it is important to have some rules to direct them. They may worry about the rules even when there are no rules. In addition to that, some traditional teachers do not believe in open education and do not like it either.
Since both of some good points and bad points of the open education have been explained clearly, you may have your own opinion on the issue. Personally, I think that the concept of open education is good only in theory. In actual fact, it may not work very well in a real class or school. I believe, most students, but of course not all students, need some structure in their classes. They may want and need to have rules.
In some cases, they must be made to study some subjects. Many students are pleased to find subjects they have to study interesting. They would not study those subjects if they did not have to.
小題1:Open education allows the students to_________________.
A．grow as the educated
B．be responsible for their life
C．discover subjects outside class
D．develop their own interests
小題2:Open education may be a good idea for the students who __________.
A．worry about grades and rules
B．a(chǎn)ren’t used to making choices
C．do well in a traditional classroom
D．enjoy having some rules in class
小題3:Some students will do little in an open classroom because___________.
A．there are too many rules
B．they don’t like activities
C．there are too few rules
D．they worry about the rules
小題4:Which of the following best summarizes the passage?
A．Open education is a really complex idea.
B．Open education is better than traditional education.
C．Traditional teachers don’t believe in open education.
D．The writer thinks open education is practical.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experiences? Strangely enough，the answer to both these questions is yes. To some extent（程度）our intelligence is given to us at birth，and special education can never make a genius(天才) out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of a person’s intelligence are fixed at birth, but whether or not he reaches those limits will depend on his environment. This view, now held by most experts can be supported in a number of ways.
It is easy to say that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random from the population, it is likely that their degrees of intelligence will be completely different. If on the other hand we take two identical twins, they  will very likely be as intelligent as each other. Relations like brothers and sisters，parents and children，usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
Imagine that now we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all, are likely to have similar degrees of intelligence.
小題1:By using the example that two people closer in blood relationship are closer in intelligence that writer wants to prove    _    .
A．intelligence can be developed by environment
B．intelligence is given at birth
C．intelligence can be developed by experience
D．education plays an important part in the development of education
小題2:A child who lives in rich and varied surroundings turns out higher in intelligence because ________.
A．his family is rich and therefore can afford to develop his intelligence
B．he can break the limits of intelligence fixed at birth
C．his family is rich and provides him with various healthy food
D．these surroundings are likely to help him reach the limits of their intelligence
小題3:In the second paragraph “if we take two unrelated people at random from the population．．．” means “if we ____．”
A．choose two persons who are relative
B．take out two different persons
C．choose two persons with different intelligence
D．pick any two persons
小題4:The best title for this passage might be __________.        
A．Birth and EnvironmentB．Intelligence
C．The Answer to a QuestionD．Intelligence and Education

查看答案和解析>>

同步練習(xí)冊答案