What is color? Why do some of the things around us look red, some green, others blue?
Colors are really made by reflected(反射)light(光). We see color because most of the things reflect light. Something is red, because it reflects most of the red light. In the same way, if something is green, it reflects most of the green light. If something reflects all light, it is white. If it doesn‘t reflect any light, it is black.
Some of the light is reflected and some is taken in(吸收)and turned into(變成)heat.The darker the colour is, the less light is reflected, the more light is taken in. So dark-colored(深色的)clothes are warmer in the sun than light-colored(淺色的) clothes.
小題1:When something reflects light, we can_______.
A．see its colorB．see its heat　　
C．not see its colorD．see nothing
小題2:Something looks white because it reflects______.
A．some lightB．no lightC．a(chǎn)ll lightD．most light
小題3:The dark-colored clothes are warm because______is taken in(吸收).
A．more lightB．less lightC．more colorD．less color
小題4:.In summer_____make people feel cool.
A．dark-colored clothesB．red-colored clothes
C．green-colored clothesD．light-colored clothes
小題5:What’s the best title(題目)of this passage?
A．Dark colorB．ColorC．HeatD．Clothes

小題1:A
小題2:C
小題3:A
小題4:D
小題5:B

試題分析：這篇短文主要介紹了為什么我們周圍的東西看起來五顏六色？那是因為大部分物體能反射光線。通過光的反射我們就能看到不同的顏色。
小題1:細節(jié)理解題。根據(jù)短文第二段We see colour because most of the things reflect light，我們能看到顏色因為大部分物體能反射光線。故選A
小題2:細節(jié)理解題。根據(jù)第二段If something reflects all light ,it is white .如果某物反射了所有的光線那么它就是白色的。故選C
小題3:推理判斷題。根據(jù)第三段The more light is taken in ,the more heat will be absorbed （吸收）. So dark-coloured  clothes are warmer in the sun than light –coloured clothes.描述，光線進入的多熱量吸收的就多，故可以判斷深顏色的衣服光線吸入更多，故選A
小題4:推理判斷題。根據(jù)第三段So dark-coloured  clothes are warmer in the sun than light –coloured clothes.描述，深顏色的衣服在太陽底下比淺顏色的衣服熱，所以夏天淺顏色的衣服涼快，故選D
小題5:標題歸納題。根據(jù)短文大意可知，文章主要是圍繞顏色來講的，故選B。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源：不詳 題型：閱讀理解

A new study finds that plants communicate with one another to warn of danger.
We often consider plants as the furniture of the natural world. They don’t move; they don’t make sounds, they don’t seem to act on anything. But as is often the case, plants talk to each other all the time. And the language is chemical.
Over the years, scientists have reported that different types of plants, from trees to tomatoes, give out chemicals into the air to help neighboring plants. These chemical warnings can spread information about one plant’s disease or infestation(蟲害), so other plants can protect themselves. But how plants receive and act on many of the information exactly is still mysterious.
In this week’s Science Magazine, researchers in Japan offered some explanations. They have found out one chemical message and traced it all the way from beginning to end.
The scientists looked at tomato plants infested by a common pest(害蟲). To start out, they grew plants in two separate plastic spaces connected by a tube(管子). One plant was infested and placed upwind and the other was uninfested and placed downwind. The downwind plants were later exposed(暴露) to the pest. The results showed that plants near sick neighbors before were able to protect themselves better against the pest.
They found one chemical appeared more often in the exposed plants. The chemical is called HexVic. The scientists discovered where HexVic come from, and put it over healthy plants. Those plants were then able to produce HexVic. Researchers made sure that uninfested plants could fight off bugs and diseases. How do they know when to protect themselves? They are warned first by their friendly plant neighbors.
It is not a simple story, and it may be happening in more plant species than tomatoes. It may also be happening with more chemical signals that are still unknown to us. In a word, we know that plants not only communicate, but also look out for one another.
小題1:The underlined “traced” in the fourth paragraph probably means _________ here.
A．reportedB．followed
C．doubtedD．developed
小題2:For scientists, which are the right steps to watch tomato plants infested by a pest?
①  Place the infested plant upwind.
②  Place the uninfested plant downwind.
③  Expose the downwind plants to the pest.
④  Grow plants in two separate plastic spaces connected by a tube.
A．③①②④B．①④③②
C．④①②③D．④②①③
小題3:You can put the sentence “The researches also studied leaves from exposed plants and unexposed plants.” At the beginning of
A．Paragraph 3B．Paragraph 4
C．Paragraph 5D．Paragraph 6
小題4:Which of the following can be the best title of this passage?
A．Communicating Plants and Terrible Diseases
B．Talking Plants and Friendly Warnings
C．Protecting Plants and Clear Information
D．Growing Plants and Mysterious Chemicals

查看答案和解析>>

科目：初中英語 來源：不詳 題型：完形填空

It is the year 2050 now. Tom and I want to visit the Mars. It is a planet (行星) far away from our planet---the      .
Our spaceship (太空船) flew       two weeks to get to the Mars. When we arrived, we       the door of the spaceship and looked out. The weather there      sunny and hot. We saw an alien (外星人) behind a tree.       is very tall and big and has brown hair.“Help me!”     the alien.Then we saw some monsters (怪獸)  running after       alien from the house near a tree. They wanted to kill him. So we had to run away      !We both moved to the        and jumped in. We also took the alien into our spaceship and       him. What an exciting day!
小題1:A. Moon                    B. Earth                C. Sun
小題2:A. for                     B. on                   C. in
小題3:A. closed                B. opened               C. had
小題4:A. did                   B. was                  C. isn’t
小題5:A. Him                     B. He                   C. They
小題6:A. shouted                B. talked               C. told
小題7:A. another                B. other               C. others
小題8:A. quickly                 B. easily              C. luckily
小題9:A. house                   B. spaceship            C. tree
小題10:A.scared                  B. interested           C. saved

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

When do you think of a forest, what do you see? Just trees Or do you see many other things, such as singing birds, colorful plants and wild flowers?
The forest is a whole world of its own. It is full of many different living things (生物). But even thoughthey are all different, they have one thing in common: they all need each other in order to live on. 
The trees feed the forest "people" by making food in their leaves; by using sunlight to join water and minerals(礦物) from the soil and air. Their deep network of roots Joins the soil together and stops it from  dying out, making it possible for living things to live in it. Human beings (人類) are like the living things in the forest. We need one another in order to live. We need the farmers to grow our food, railroad and truck drivers to bring it to our shops and clerks (售貨員) to sell it to us. We need people to prepare our food and
cook it and others to take our waste things away. Then, of course, we need doctors, nurses, government  leaders, mailmen, telephone operators, and many others. We also need other human beings in another way. 
We need people for friendship, to talk over our problems, exchange ideas. Think how lonely and unhappy you would be if you lived all alone. 
Life is a matter of giving and taking. We need to help other people as much as we need other people to help us. Think what a good feeling you have when you have done something for someone else. You know,  being a volunteer is so great!
根據(jù)短文內(nèi)容，判斷下列句子正誤。正確的用“A”表示，不正確的用“B”表示。
小題1:According to the text, different things live on the soil and air.
小題2:The water and minerals join from the soil and air by using sunlight.
小題3:According to the writer, human beings need only farmers.
小題4:When I have done something for someone else, I feel happy.
小題5: According to the passage, everyone needs friends.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Do you hope to do a lot of homework every evening ? Are you interested in your classes ? Who do you want to teach you ? Maybe you have lots of questions in your mind before school starts· Well, I want to give you some good advice on these problems. First,keep calm. Don't worry about all the questions you have. Put your heart into learning and you can find something you are interested in. Do it actively（積極地）. Second, try your best to finish your homework quickly. Don't spend a lot of time on it. Do more reading or writing in English.Think about the problems you have and solve them at once. Don't stay up late, or you can't study.well the next day.   Third, think of something instead of copying or repeating. If you can remember the words in your way, can tell your teachers you don't like the way of copying them again and again. Be sure you can pass the test. I think your teachers will agree with you. And they can give you something interesting to do. School is really a good place. Believe in your teachers and yourself. You are the best one and you can do everything well.
小題1:The writer writes the passage to________.
A．give students some good ways of learning
B．a(chǎn)sk students not to listen to tlleir teachers
C．a(chǎn)sk students not to do their homework
D．tell students what a good teacher is
小題2:.How many pieces of advice does the writer give us________?
A．3B．4C．5D．6
小題3:What does the writer tell students to do about their English homework?_______    _ .
A．They should spend a lot of time on it
B．They should stay up late doing
C．They should do more reading or writing in English
D．They should have boring work to do
小題4: What's the third piece of advice about?________      .
A．How to get on with friends
B．How to get high grades
C．what kind of schoolwork is better for students
D．How to finish the homework in a short time
小題5:According to（根據(jù)） the passage.students should believe in________.
A．themselves and their classmatesB．themselves and their parents
C．their parents and teachersD．themselves and their teachers

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

For hundreds of years, scientists have been trying to answer what things have an effect on people’s emotions (情感). How you feel is controlled by many things. Your emotions can be affected by your personality, by the actions of others and by events around you. Perhaps you don’t know your emotions can be influenced by the weather as well.
People often say they feel good when the sun is shining and sad when it is cloudy.In fact, sunlight makes us feel good.When sunlight hits our skins,our bodies produce a vitamin. Vitamins are natural chemicals(化學(xué)物質(zhì))which we all need to stay healthy.Sunlight helps our bodies produce vitamin D.Vitamin D helps our bodies make a special chemical.This special chemical affects our brains(大腦)and makes us feel happy.For example, there are long, dark winters of little sunlight in Sweden and Norway,so many peple in these countries often feel sad.Without much sunlight, their bodies produce less vitamin D.Without enough vitamin D, their bodies make less of this special chemical which makes them feel good.To help the people in these countries feel better,special “sunrooms”with artificial(人造的)lights have been built.People can go there and get “sunlight”for an hour or two!
The weather can also affect people’s emotions in other ways. Hot weather can make people angry because people feel uncomfortable when they are hot. In the same way, rain can make people angry because being wet can be unpleasant. As you can see, the weather can have an effect on the chemicals which control our brains. Through these ways, the weather can influence our emotions. Sadly, while the weather can change us, we can hardly change the weather.
小題1:Which of the following is NOT mentioned as a factor (因素) that can affect one’s emotions?
A．Weather.B．Actions of others.
C．Personality.D．Age.
小題2:Which of the following is true about vitamin D according to the passage?
A．It is a kind of artificial chemical.
B．It makes us worried by affecting our brains.
C．It is needed by us all to keep fit.
D．It is in the sunlight.
小題3:What can we infer (推斷) from the passage?
A．We feel good when we are in the bright cool weather.
B．We will be happy when we are caught in the rain.
C．All people in Norway and Sweden feel sad in winter.
D．The more vitamin D you have, the happier you’ll be.
小題4:What may be the best title for this passage?
A. Why Do We Feel Sad?            
B. The Weather Influences People’s Emotions.
C. People Need More Vitamin D.      
D. We Can Hardly Change the Weather.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

  How could we tell time if there were no watches or clocks anywhere in the world?
The sun is probably the world’s first “clock”, except in the far north, where the Eskimos(愛斯基摩人) live. There, it’s dark most of the winter, and light most of the summer. But in most of the world, people have used the sun as a clock. Even today, if you don’t have a clock, you can still know that when the sun shines, it’s day and when it’s dark, it’s night. The sun can also tell you if it’s morning, noon, or afternoon.
Some people live near the sea from the tides. In the daytime, for about six hours, water rises higher and higher on the beach. And then it goes down and down for about six hours. The same thing happens again at night. There are two high tides and two low tides every 24 hours. Seamen on the ship learn how to tell time by looking at the moon and the stars. The whole sky is their clock.
In some places in the world the wind comes up at about the same time every day or changes direction or stops blowing. In these places the wind can be the clock.
A sand clock is an even better clock. If you had fine dry sand in a glass shaped like the one in the picture, you would have what is called an hourglass. The sand in the hourglass goes from the top part to the bottom in exactly one hour. When the hourglass is turned over, the sand will take another hour to go back again
小題1: From the passage we can know there are _______ways to tell time besides the clock and watch.
A．3B．4C．5D．7
小題2:. The Eskimos in the far north can’t use the sun for a clock because________
A．they know very little about the sun
B．the sun there never goes down in winter
C．it’s too cold for them to go out to watch the sun
D．it has long dark winters and long light summers
小題3:. What does the underlined word “tides” mean in the passage?
A．洋流B．潮汐C．海嘯D．波浪
小題4: In which page of newspaper can you probably read this passage?
A．NewsB．ScienceC．AdvertisementD．Sports
小題5: What is the best title for the passage?
A．Different Ways to Tell TimeB．How the Clock Was Invented
C．The Development of the ClockD．A Useful Machine to Tell Time

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Rivers are one of our most important natural resources (資源). Many of the world's great cities are located(坐落) on rivers, and almost every country has at least one river running through it that plays an important role in the lives of its people.
Since the beginning of the history, people have used rivers for transportation(運輸). The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Gangs is great, but it is also important for transportation; Ships can travel along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeast Asia. The greatest of all for navigation (航海), however, is the Amazon in Brazil. It is so wide and so deep that large ships can go about two thousand miles upon it.
Besides transportation, rivers give food, water to drink, water for crops(莊稼), and chances for fun and entertainment for the people who live along their banks. In order to increase(增加) the supply of crops, engineers sometimes build a dam (大壩) across a river and let a lake from behind the dam. Then people can use the water not only to irrigate (灌溉) their fields but also to make electricity for their homes and industries.
However, large cities and industries that are located upon rivers often make problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals(化學(xué)物質(zhì)) and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits (利益) of this natural resource.
小題1:The greatest river for navigation is ___________.
A．the Amazon B．the Nile
C．the MekongD．the Mississippi
小題2:From a dam, people can use the water for ___________.
A．keeping the rivers cleanB．only making electricity
C．washing clothesD．irrigation and making electricity
小題3:The water in the river is polluted because of _____________.
A．people's drinking water too much
B．people's swimming in the river too much
C．chemicals and other materials
D．people's building a dam across a river
小題4:The best title of the passage is ___________.
A．Rivers in Cities B．The importance of Rivers
C．TransportationD．Natural Resources

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Since the 1970s, scientists have been searching for ways to connect the brain with computers. Braincomputer interface(BCI) technology could help people with disabilities send commands to machines.
Recently, two scientists, Jose Millan and Michele Tavella from the Federal Polytehnic School in Lausanne, Switzerland, show a small robotic wheelchair directed by a person’s thoughts.
In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.
“Our brain has billions of body cells(細胞). These send signals through the spinal cord(脊髓) to the body part to give us the ability to move. But spinal cord injuries(脊柱受傷) or other conditions can prevent these weak electrical signals from reaching the body part.” Tavella says. “Our system allows disabled people to communicate with outer world and also to control machines.”
The scientists designed a special cap for the user. This head cover picks up the signals from the scalp(頭皮) and sends them to a computer. The computer finds meanings of the signals and commands the wheelchair with an engine. The wheelchair also has two cameras that tell objects in its path. They help the computer react to commands from the brain.
Prof. Millan , the team leader, says scientists keep improving the computer software that finds meanings of brain signals and turns them into simple commands.” The practical possibilities that BCI technology offers to disabled people can be grouped in two kinds: communication, and controlling objects. One example is this wheelchair.”
He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can get advantages from. And the other is sure that they can use the technology for long.
小題1:BCI is a technology that can________.
A．help to make computer systems more modern
B．connect the human brain with computers
C．help the disabled to be healthier
D．control a person’s thoughts
小題2:Which of the following shows the path of the signals described in Paragraph 5?
A．scalp→computer→cap→wheelchair
B．computer→cap→scalp→wheelchair
C．scalp→cap→computer→wheelchair
D．cap→computer→scalp→wheelchair
小題3:The team will test with real patients to_________.
A．make money from them
B．prove the technology useful to them
C．make them live longer
D．learn about their physical condition
小題4:Which of the following would be the best title for the text?
A．Switzerland, the BCI research Center
B．New Findings About How the Human Brain Works
C．BCI Could Mean More Freedom for the Disabled
D．Robotic Vehicles Could Help to Cure Brain Sickness

查看答案和解析>>

同步練習(xí)冊答案