The color red often means danger --- and by paying attention, accidents can be prevented. At railroad crossings, flashing red fights warn cars to stay back. A red light at a traffic crossing tells cars to stop, so they don't run into other cars.
In the future, the color red also may help prevent danger at construction sites. Thanks to new work by engineers, bridge supports --- or other kinds of materials --- could one day contain a color-changing material. It will turn red before a structure collapses(倒塌) or falls apart.
The secret behind the color-changing material is a particular type of molecule(分子). Molecules come in all shapes and sizes, and make up everything you can see, touch or feel. How a molecule behaves depends on what kinds of atoms(原子) it contains, and how they're held together.
To get a rough picture of one way atoms are held together in a molecule, imagine you and your friends standing in a large circle, holding hands. Each person represents one atom, your clasped hands represent the bond, and the entire circle represents a molecule.
The molecule being used to turn the material red is called mechanophore(機(jī)械響應(yīng)性聚合物). When one chemical bond in the mechanophore molecule breaks, the rest of the molecule turns red.
There is a way to get rid of~ the red color: light. When a bright light is shone on the mechanophore, the broken bond is fixed and the red color disappears. This "self-healing" may be a problem for engineers who want to use the color-changer in big construction projects that will be outside, in the sunlight. And if bright light keeps the red color from appearing, then the mechanophore's warning system will be useless.
Scientists still have a lot of work to do before the color-changing molecules can be used outside the lab. If mechanophore can be used in the real world, they are suggested to be employed in a new kind of paint.
【小題1】The first paragraph mainly tells us __________.

A．the color red is widely used in our life 
B．how to prevent car accidents 
C．the color is an important signal of warning 
D．how to use color red 
【小題2】The color red will be used at construction sites to _________.
A．tell different materials used in the building 
B．warn people that the building is dangerous 
C．make the building more beautiful  
D．tell people the building is under construction 
【小題3】The example given in the fourth paragraph is to show _________.
A．the way atoms are held together in a molecule 
B．how a molecule behaves in an object 
C．how to play an old game 
D．how people get along with each other 
【小題4】What can make the mechanophore’s warning system ineffective?
A．Paints B．Water C．Poor building materials D．The bright light 


【小題1】C
【小題2】B
【小題3】A
【小題4】D

解析試題分析：文章介紹了一種新型的建筑材料，可以在大樓危險(xiǎn)的時(shí)候，變化成紅色，從而警告人們當(dāng)心，但是這種材料也有缺點(diǎn)，研究人員還要做大量的研究工作。
【小題1】段落大意題：從第一段的句子：The color red often means danger可知這段講的是顏色是一個(gè)很重要的警告信號(hào)，選C
【小題2】細(xì)節(jié)題：從文章第二段的句子：In the future, the color red also may help prevent danger at construction sites.可知建筑工地的紅色警告人們這個(gè)建筑是危險(xiǎn)的，選B
【小題3】細(xì)節(jié)題：從第四段的句子；To get a rough picture of one way atoms are held together in a molecule, 可知這個(gè)例子是為了表明在分子里面原子是怎么組合的，選A
【小題4】細(xì)節(jié)題：從第六段的句子：When a bright light is shone on the mechanophore, the broken bond is fixed and the red color disappears.可知使機(jī)械響應(yīng)性聚合物失效的是明亮的顏色，選D
考點(diǎn)：考查科普類短文

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：閱讀理解

DAVID Beckham. Cristiano  Ronaldo and Rnfacl Nadal while you watch sports and admin* the players’ skills, do you ever notice how handsome the players are?
Yes, sportsmen tend to be handsome. And they haven’t only attracted the interest of the audience even scientists are now studying their good looks.
In a recent study, Erik Postma, a biologist at the University of Zurich in Switzerland, collected the headshots（頭像）of 80 professional athletes from I hr 2012 Tour He France, a bicycle race held in Franco. The race, which covers 3,200 kilometers in 23 days, is often considered to In* one of the hardest endurance（耐力）events, according to The Telegraph.
Postma then asked female participants to score the cyclists’ attractiveness.judging them only based on their facial appearances. So, if a participant recognized any of the cyclists, meaning she knew how good he was at the sport, her score wouldn’t count.
After comparing all the scores with the cyclists’ performances in the 2012 race, Postma was surprised to find that the best riders were rated on average 25 percent more attractive than the worst ones. For example, one of the cyclists, Maxime Monfort , came third in terms of attractiveness and sixth in terms of performance, reported Discovery News.
But where did women get the ability to single out a good rider by simply looking at his face?
According lo Postma, evolution (進(jìn)化) seems to be the answer. In ancient times, women preferred to marry strong men because they would provide good genes for their children. A man with great endurance was also able to cover long distances to hunt for food, which would allow him to better feed the family. “That’s why endurance performance was a key evolutionary factor.” Postma told Discovery News.
As you can see, it’s not that sportsmen ate more attractive themselves, women were just born to think of them that way.
Perhaps surprisingly, when Postma did the same test with male participants, he found that men actually had a quite similar view on which riders were handsome. Even
though most men aren’t aware of it. they inherited (繼承) this ability from their ancient past, when it was necessary to “spot potential competitors” , explained Postma.
【小題1】What did Erik Postma ask female participants to do in his study?

A．To help collect the headshots of professional cyclists from the Tour de France.
B．To pick out the cyclists whom they are familiar with or appreciate most.
C．To rate the cyclists’ attractiveness according to facial appearance.
D．To predict the cyclists ’ performances based on facial appearance.
【小題2】What did Postma discover from his study?
A．The more attractive a cyclist was, the better he performed in the race.
B．Generally, a cyclist’s endurance had nothing to do with his attractiveness.
C．Attractive cyclists proved to have less endurance than those who were less attractive.
D．Those who performed best in the games were considered more attractive than those who performed worst.
【小題3】What can we conclude from the last three paragraphs?
A．Women and men hold quite different views on male attractiveness.
B．Men with good looks tend to lie less popular than men with great endurance.
C．A man with great endurance appealed to women in ancient times and this remains the same today.
D．Most men don* t have the same ability as women to single out a good sportsman by simply looking at his face.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

The earth is the only planet that scientists think has life. Why does the earth have life while the other planets (行星) don't? For one thing, the earth is just the right temperature. As the_third_planet from the sun, the earth seems to be just the right distance away. The planets which are closer to the sun are hot that their surfaces bake (烘烤) in the sun. The farthest planets are cold balls.
When the earth developed — which scientists believe may have happened about 4 billion years ago — many gases covered the earth. The gases caused the earth to be hot. But something wonderful happened. The temperature was just right for thick clouds to form. It rained very hard for a very long time. This gave the earth its oceans. Water made it possible for plants to grow. The plants created oxygen in the atmosphere. Oxygen is the gas that humans and animals breathe.
Only one other planet in the solar system seems to be something like the earth. That planet is Mars (火星). Mars is smaller than the earth, and it is quite a bit cooler. But it is not too cold for humans. On some days, the temperatures are as low as a winter day in the northern United States. If you wore a special space suit, you could walk around on Mars. You would have to bring your own air to breathe, the air on Mars is too thin to breathe.
Mars has the largest volcano (火山) in the solar system. It is sixteen miles high. The highest volcano on the earth is five miles high. The most unexpected (未預(yù)測(cè)到的) sight on Mars is dried up river beds. Scientists believe that Mars was once much better than it is now. Does this mean there could have been living things on Mars? Scientists are not sure, but there has been no sign so far.
【小題1】Which of the following is NOT the reason that the earth has life?

A．The earth is just the right temperature.
B．The volcanos on earth are lower than those on Mars.
C．There is oxygen in the atmosphere of the earth.
D．The earth seems to be just the right distance away from the sun.
【小題2】The underlined phrase “the third planet” in the first paragraph refers to ________.
A．the SunB．the Moon
C．the EarthD．the Mars
【小題3】Which of the following about the Mars is NOT true?
A．There could have been living things on Mars.
B．Mars has the largest volcano in the solar system.
C．There is almost no oxygen in the air on Mars.
D．Mars is smaller than the earth, and it is quite a bit cooler.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Can dogs and cats get along well in the same home? People who are thinking about getting a dog as a friend for their cat are worried that they will fight. A recent research has found that if the cat is taken back home before the dog, and if they are introduced when still young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along swimmingly. In two-thirds of the homes cats and dogs have a good relationship.
However, it wasn’t all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression(侵略，好斗) and fighting were found in 10% of the homes. One reason for this is probably that some of their body languages are just different. For example, when a cat turns its head away it means aggression, while a dog doing the same means submission(順從).
In homes with cats and dogs living peacefully, researchers found a surprising behavior. They are learning how to talk each other’s language. It is a surprise that cats can learn how to talk “Dog”, and dogs can learn how to talk “Cat”.
What’s interesting is that both cats and dogs have appeared to become smarter. They can learn to read each other’s body languages, suggesting that the two may have more in common than was expected. Once familiar with each other’s body language, cats and dogs can play together, and enjoy sleeping together on the sofa.
The importance of this research on cats and dogs may go beyond pets — to people who don’t get along well, including neighbors, colleagues at work, and even countries. If cats and dogs can learn to get along, surely people have a good chance.
【小題1】Some cats and dogs may fight when ________.

A．they are cold to each other
B．they look away from each other
C．they misunderstand each other’s body languages
D．they are introduced at an early age
【小題2】What is found surprising about cats and dogs?
A．They eat and sleep together.
B．They watch each other’s behaviors.
C．They learn to speak each other’s language.
D．They know something from each other’s voices.
【小題3】It is suggested in Paragraph 4 that cats and dogs ________.
A．have common interests
B．a(chǎn)re less different than was thought
C．have a common body language
D．a(chǎn)re not so smart as was expected
【小題4】What can we human beings learn from cats and dogs?
A．We should learn to get along well with others.
B．We should know more about animals.
C．We should live in peace with animals.
D．We should learn more body languages.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

How the Grand Canyon (大峽谷) was created remains one of the geology’s greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.
Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤壩) bursts.
Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔巖) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.
Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers.
The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon.
The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet.
【小題1】In the past, deep canyons were believed to have formed _______.

A．a(chǎn)s a result of a sudden break of volcanoes 
B．due to river flows over millions of years 
C．owing to the burst of artificial dams 
D．thanks to our ancestors’ creative work 
【小題2】According to the passage, which of the following statements is TURE?
A．Several volcanoes broke out on Mars directly creating grand canyons. 
B．Several great lakes existed on the upper parts of the Colorado River. 
C．People built high dams on the upper parts of the Colorado River. 
D．The Colorado River crossed the Grand Canyon to form down-cutting. 
【小題3】From the last three paragraphs we learn that _______.
A．there are great lakes on Mars 
B．there are active volcanoes on Mars 
C．there might be cities on Mars 
D．there might be life on Mars 
【小題4】The passage can be titled as _______.
A．Lakes on Earth and Mars 
B．The Cause of Lake Formation 
C．The Force of Dam Breaking 
D．Canyons—Results of Flood Cutting  

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Pilling a cat can be a 'terrible” experience. Cats don’t want something pushed down their throats, and they’ll fight with all their strength to prevent it. In fact, it’s amazing how powerful their small bodies can be.
The easiest way of pilling a cat is to press the pill into powder. Then mix the powder with a small amount of wet food. If your cat usually eats dry food, she will probably view the wet food as a treat and eat it up.
If your cat won’t eat the wet food that contains the pill or if she is too ill to eat, you can get a “pill gun”. There are some basic instructions. Getting your cat’s mouth to open is going to be the most difficult part. First, be sure the pill is in a handy place. Then you can put your cat on a bookshelf with her bottom in a corner or you can put her on your lap firmly tied. Have your cat facing to the right if you’re right-handed. With your left hand, hold your cat at the cheekbones, putting your palm (手掌) at the top of her head. Keeping your finger off the trigger (扳機(jī)), with your right hand, Insert the pill gun until the pill is positioned over the tongue and open throat Be sure to give your cat a treat directly after giving the pill.
If you don’t feel comfortable using a pill gun, you can try giving the pill by hand. Push your cat’s head backwards just far enough so that her nose is pointing towards the ceiling. At this point, most cats will slightly open their mouths. With the little finger or ring finger of the hand holding the pill, open the bottom jaw a little more. You may need to hold her top jaw with your other hand while doing this. Aim straight and lightly throw the pill or drop it. Most cats will then swallow the pill.
【小題1】Pilling a cat can be a terrible experience because cats ______.

A．a(chǎn)re amazingly powerful and dangerous
B．may fight with all their strength against pills
C．refuse something pressed down their throats
D．a(chǎn)re difficult to treat once they’ve got ill
【小題2】Which of the following statements is true according to the second paragraph?
A．Wet food with medicine is usually a treat to cats.
B．Cats used to dry food must reject wet food.
C．The easiest pilling is to press the pill into powder.
D．Cats arc most likely interested in something new.
【小題3】Using a “pill gun”, you had better hold your cat ______ if you’re left-handed.
A．facing to the right B．with your right hand
C．a(chǎn)t the head D．on your lap firmly
【小題4】A cat probably opens its mouth naturally when ______.
A．its nose is straight upwards B．it is touched by fingers
C．its head is turning around D．it is served with its favorite pills

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answer to these questions is yes. To some extent our intelligence is given to us at birth, and no amount of education can make a genius 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 person’s intelligence are fixed at birth, 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 show 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 intelligence. Thus if we take two unrelated people at random from population, it is likely that their degree of intelligence will be completely different. If, on the other hand, we take two identical twins, they will very probably 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 now that 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 degree of intelligence.
【小題1】 The writer is in favor of the view that man’s intelligence is given to him____________.

A．a(chǎn)t birth
B．through education
C．neither at birth nor through education
D．both at birth and through education
【小題2】If a child is born with low intelligence, he can_____________________.
A．become a genius
B．still become a genius if he should be given special education
C．reach his intelligence limits in rich surroundings
D．not reach his intelligence in his life.
【小題3】The example of the twins going to a university and to a factory separately shows_________.
A．the importance of their intelligence
B．the importance of their positions
C．the role of environment on intelligence
D．the part that birth plays

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Plastic is one of the most important technological discoveries of the 20th century.However，it may soon be replaced.The new development—liquid wood—can replace plastics in all branches of modern industries.
Plastic as a material enjoys the biggest demand in the modern world，but it does have a number of drawbacks.First and foremost，plastic isn’t recyclable.Secondly，it contains toxins (毒物) helping develop cancerous diseases.Finally，it’s made of oil and oil reserves aren’t endless.
The  liquid wood technology is likely to replace plastic and provide mankind with new materials for many years ahead.Norbert Eisenfreich，a senior researcher at  the Faunhofer Institute for Chemical Technology (ICT) in Germany，said that arboform，the new material，is made of lignin (木質(zhì)素)，which can be obtained from soft tissues of wood.Once mixed with several other materials，it turns into solid and non­toxic alternative for plastics.
ICT team leader Emilia Regina Inone­Kauffmann said the wood­working industry separates wood into three basic components，including lignin.Lignin isn’t used for the production of paper.Specialists of ICT mixed lignin with several natural materials and thus invented the material which could be melted and molded (鑄型)．
When solid，arboform looks like plastic and possesses the qualities of polished wood.It can be used for the production of any items.Arboform is already used for the production of car parts which require extra strength.In addition，liquid wood can be recycled repeatedly.The material preserved all of its qualities even if it’s reprocessed ten times.
However，the new invention doesn’t enjoy an extensive use due to the high content of sulphur (硫) in it.German researchers are sure to reduce the amount of sulphur by 90 percent very soon to make arboform usable for home needs.
【小題1】According to the passage，plastic________.

A．plays a big role in the modern world
B．helps to protect our environment in some way
C．has been replaced by the newly discovered material
D．helps us to reduce the use of petrol
【小題2】What’s the advantage of arboform over plastics?
A．It is easily made from natural oil.
B．It is more widely used in household.
C．It is recyclable and friendly to the environment.
D．It contains no poisonous materials.
【小題3】It can be concluded that German researchers will focus their future work firstly on________.
A．the material’s extensive use
B．the content of sulphur in arboform
C．the production cost of arboform
D．the qualities of liquid wood
【小題4】The main purpose of the passage is to________.
A．a(chǎn)dvertise the new material—arboform
B．introduce liquid wood which will replace plastic
C．a(chǎn)dvertise new products made of arboform
D．show readers how to produce arboform

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Redwood trees are the tallest plants on the earth，reaching heights of up to 100 meters．They are also known for their longevity，typically 500 to 1000 years，but sometimes more than 2000 years．A hundred million years ago，in the age of dinosaurs，redwoods were common in the forests of a much more moist and tropical North America．As the climate became drier and colder，they declined to a narrow strip along the Pacific coast of Northern Califomia．
The trunk of redwood trees is very strong and usually forms a single straight column．It is covered with a soft bark．This bark can be pretty thick，well over two feet in the more mature trees．It gives the older trees a certain kind of protection from insects，but the main benefit is that it keeps the center of the tree harmless from moderate forest fires because of its thickness．This fire resistant quality explains why the giant redwood grows to live that long．While most other types of trees are destroyed by forest fires，the giant redwood actually prospers because of them．
Moderate fires will clear the ground of competing plant life，and the rising heat dries and opens the ripe fruit of the redwood，releasing many thousands of seeds onto the ground below．
New trees are often produced from shoots，little baby trees，which form at the base of the trunk．These shoots grow slowly，fed by the root system of the “mother’’ tree．When the main tree dies，the shoots are then free to grow as full trees，forming a “fairy ring” of trees around the original tree．These trees，in turn，may give rise to more shoots，and the cycle continues．
【小題1】Why were redwood trees easier to find in the forests of North America millions of years ago?

A．The trees were taller and stronger． 
B．The soil was softer for seeds to develop． 
C．The climate there was warmer and wetter． 
D．The temperature was lower along the Pacific coast． 
【小題2】Which of the following is a function of the tree bark as mentioned in the passage?
A．It allows redwood trees to bear seeds． 
B．It prevents redwood trees from attack by insects． 
C．It helps redwood trees absorb water in the air． 
D．It makes redwood trees more beautiful and appealing． 
【小題3】Why do redwood trees grow to live that long according to the passage?
A．They have heavy and straight tree trunks． 
B．They are properly watered and catered to． 
C．They are more resistant to fire damage than other trees． 
D．They produce many young trees to maintain their life cycle． 
【小題4】How does a “fairy ring’’ form according to the passage?
A．By killing an old tree． B．By connecting root systems． 
C．By inserting holes into old trees． D．By surrounding a mature tree． 

查看答案和解析>>

同步練習(xí)冊(cè)答案