Analysis of the composition of quicksand shows that there are four key ingredients—sand, obviously water, clay and salt. Together these materials form a structure resembling a house of cards, with large water-filled gaps between the sand particles, which are loosely glued in place by the clay. As long as it’s left alone, the structure remains stable. But as soon as it’s disturbed, by stepping on it, the clay changes from a jelly-like consistency to a runny liquid. The effect is the same as stirring a pot of yoghurt. Liquefying(溶解)the clay makes the quicksand about one million times runnier, and the whole house of cards comes tumbling down, with you inside it.
Very quickly, the sand sinks to the bottom and the water floats to the top. This is where the salt comes in. When there’s enough salt present, as soon as the clay particles liquefy, electrical charges make them begin to stick together to form bigger particles and these also settle with the sand. Quicksand is a mixture which looks like solid, but behaves more like a liquid.
Despite its murderous reputation, quicksand does not such people under and swallow them, although it can hold a person in firm grip. The human body is more buoyant(有浮力) in quicksand than in water, and sooner or later anyone trapped in it will float.
Unlike most liquids, quicksand’s viscosity, or “runniness” can suddenly change if it comes under pressure, for example under a human foot. The surface gives way and the victim quickly sinks in up to the knees, surrounded by an area of dirty things that turns semi-solid around its victim. Escaping from the quicksand’s grip(紧握) requires a large amount of force. Without something solid to pull at, people often find they are stuck fast. Pulling at one leg simply makes the other one sink further.
So how do you escape from quicksand’s control? Stay still and call for help. Staying still stops you sinking any further, until--with luck--help arrives on the scene. If no one appears and you need to draw yourself out, gently lie down on your back until your body is floating on the sand. Next, roll over onto your stomach and pull yourself forwards with your hands, so that you gradually “swim” towards firmer ground. It is a slow and dirty business, but it works.
This technique has one barrier: it goes against a very powerful human nature. Faced with danger in the open, nine out of ten stay on their feet so that they can run away, in which case it can worsen the situation.
1.Which ingredient of the quicksand make someone trapped in it stuck and stuck fast?
A. Sand B. Clay C. Water D. Salt
2.From the passage we can learn that ________
A. as long as you are strong enough, you can pull yourself up from quicksand on your own
B. clay glues sand particles loosely, which makes quicksand stable, unless it is disturbed
C. because anyone trapped in quicksand will float, there is little possibility of him dying
D. looking like solid ground, quicksand is actually liquid
3.If someone is trapped in quicksand, what should he do?
A. Remain calm and wave for help
B. Stand in quicksand and get ready to run away as quickly as possible
C. “Swimming” is one of the best choices he can use to escape
D. Once in quicksand, lie down on his stomach immediately and swim slowly to safety
4. What might be the best title of the passage?
A. A human killer--quicksand
B. How to escape from danger
C. An awful experience in quicksand
D. What to do if trapped in quicksand
高三英语阅读理解中等难度题
Analysis of the composition of quicksand shows that there are four key ingredients—sand, obviously water, clay and salt. Together these materials form a structure resembling a house of cards, with large water-filled gaps between the sand particles, which are loosely glued in place by the clay. As long as it’s left alone, the structure remains stable. But as soon as it’s disturbed, by stepping on it, the clay changes from a jelly-like consistency to a runny liquid. The effect is the same as stirring a pot of yoghurt. Liquefying(溶解)the clay makes the quicksand about one million times runnier, and the whole house of cards comes tumbling down, with you inside it.
Very quickly, the sand sinks to the bottom and the water floats to the top. This is where the salt comes in. When there’s enough salt present, as soon as the clay particles liquefy, electrical charges make them begin to stick together to form bigger particles and these also settle with the sand. Quicksand is a mixture which looks like solid, but behaves more like a liquid.
Despite its murderous reputation, quicksand does not such people under and swallow them, although it can hold a person in firm grip. The human body is more buoyant(有浮力) in quicksand than in water, and sooner or later anyone trapped in it will float.
Unlike most liquids, quicksand’s viscosity, or “runniness” can suddenly change if it comes under pressure, for example under a human foot. The surface gives way and the victim quickly sinks in up to the knees, surrounded by an area of dirty things that turns semi-solid around its victim. Escaping from the quicksand’s grip(紧握) requires a large amount of force. Without something solid to pull at, people often find they are stuck fast. Pulling at one leg simply makes the other one sink further.
So how do you escape from quicksand’s control? Stay still and call for help. Staying still stops you sinking any further, until--with luck--help arrives on the scene. If no one appears and you need to draw yourself out, gently lie down on your back until your body is floating on the sand. Next, roll over onto your stomach and pull yourself forwards with your hands, so that you gradually “swim” towards firmer ground. It is a slow and dirty business, but it works.
This technique has one barrier: it goes against a very powerful human nature. Faced with danger in the open, nine out of ten stay on their feet so that they can run away, in which case it can worsen the situation.
1.Which ingredient of the quicksand make someone trapped in it stuck and stuck fast?
A. Sand B. Clay C. Water D. Salt
2.From the passage we can learn that ________
A. as long as you are strong enough, you can pull yourself up from quicksand on your own
B. clay glues sand particles loosely, which makes quicksand stable, unless it is disturbed
C. because anyone trapped in quicksand will float, there is little possibility of him dying
D. looking like solid ground, quicksand is actually liquid
3.If someone is trapped in quicksand, what should he do?
A. Remain calm and wave for help
B. Stand in quicksand and get ready to run away as quickly as possible
C. “Swimming” is one of the best choices he can use to escape
D. Once in quicksand, lie down on his stomach immediately and swim slowly to safety
4. What might be the best title of the passage?
A. A human killer--quicksand
B. How to escape from danger
C. An awful experience in quicksand
D. What to do if trapped in quicksand
高三英语阅读理解中等难度题查看答案及解析
Paragraph 1
Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds. (2) citrus(柑桔) fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal(谷类), rice is also in this kind of food; (7) butter, or something like butter.
Paragraph 2
People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.
Paragraph 3
There are two problems, then, in feeding the large number of people on earth. The first is to find some ways to feed the world’s population so that no one is hungry.The second is to make sure that people everywhere have the right kinds of food to make them grow to be strong and healthy.
1.According to the scientists, which of the following groups of food is the healthiest for your lunch?
A. chicken, apples, cereal, cabbages B. potatoes, carrots, rice, bread
C. oranges, bananas, fish, tomatoes D. beef, pork, fish, milk
2.It is important for people to eat _______.
A. three times a day B. dinner at twelve o’clock
C. cooked food all the day D. something from each of the seven kinds of food every day
3.People in different countries and different places of the world _______.
A. has the right kinds of food to eat B. cooks their food in the same way
C. has their meals at the same time D. eat food in different ways
4.If there is Paragraph 4, what do you think is going to be talked about?
A. When people eat their lunch B. What to do with the two problems
C. How to cook food in different ways D. Why people eat different kinds of food
高三英语阅读理解困难题查看答案及解析
However, there was one band that started in a different way. It began as a TV show. The musicians of 31________ the band was formed played jokes 32___________ each other as well as played music. Their music and jokes were based loosely on the band called “The Beatles”. The TV organizers 33 (look) for four musicians who were lively and who could make good music. They put an advertisement in a newspaper 34 (look) for rock musicians, but they could only find one that was good enough. They had to use actors for the other members of the band. Actors may not be able to sing so at first other musicians sang the songs for the programme 35 the band pretended to sing them.
Their attractive performances 36 (copy) by other groups and their fans supported them fiercely. Each week the group that was called “The Monkees” would play a song or two written by other musicians. However, after a year or so in which they became 37 (serious) about their work, “The Monkees” started to play their own instruments and write their own songs like a real band. Then they produced their own records and started touring and playing their own music. They became even more popular than “The Beatles” in the USA and sold even more records. However, the band broke 38 in about 1970, but 39 (unite) in the mid-1980s. They produced a new record in 1996, which was a 40 (celebrate) of their time as a real band.
高三英语填空题简单题查看答案及解析
Reading is good for you. There is increasing evidence to show that reading isn’t merely a way of improving literacy and knowledge, but that it might actually be good for one’s mental and physical health, too.
In the age of Twitter and short attention spans, reading novels, which requires intense concentration over a long period of time, could be the antidote(矫正方法).
Neuroscientists Baroness Susan Greenfield says that reading helps to lengthen attention spans in children and improve their ability to think clearly. “Stories have a structure that encourages our brain to think in sequence, to link cause, effect and significance,” she says “It is essential to learn this skill as a small child.”
“In a computer game, you might rescue a princess, but you don’t care about her, you just want to win,” she explains, “But a princess in a book has a past, present and future. You can relate to her. You see the world through her eyes”
According to professor John Stein, Oxford university, reading is far from a passive activity. “Reading exercises the whole brain,” he explains. “ When we get lost in a good book, we are doing more than following a story, Imaging what is happening is as good as activating the brain as doing it. In other words, our brains simulate(模仿) real experiences, and it is just as if we were experiencing them ourselves. This doesn’t happen when we are watching a TV or playing computer games.”
Getting stuck in a good novel appears to be good for one’s mental health. Reading helps one not only fights loneliness, but also forget one’s own problems for a while.
Researchers found that just six minutes of reading could reduce stress levels by more than two-thirds, more than listening to music or going out for a walk. The concentration required to read distracts the mind, easing muscle’s tension and slowing the heart rate. Reading may be good for physical health, too, by preventing brain aging and disease.
1.Which of the following statement is true about playing computer games?
A. It encourages our brains to think clearly
B. It makes people feel lonely
C. It makes the player concentrate on the result instead of the role in it
D. It can help lengthen one’s attention span.
2.According to John Stein, reading _______
A. is simply following a story
B. is a passive activity
C. can active the brain
D. has the same results as watching TV
3.What is the main purpose of this passage?
A. To show how to improve children’s attention spans
B. To encourage people to read
C. To show that Twitter has a negative influence
D. To compare the results of reading and watching TV
4.The last two paragraphs are mainly about
A. the mental and physical benefits of reading
B. ways of getting rid of stress
C. the problems we face in daily life
D. the factors that cause people to feel lonely
5.What would be the best title for the passage?
A. Reading Books Helps Keep Your Healthy
B. The Structure of a Book
C. The Brain Activities While Reading
D. How to Teach Children to Read
高三英语阅读理解困难题查看答案及解析
There are ______ to show that a new , different city is coming out of its dark past .
A. signals B. marks C. signs D. symbols
高三英语单项填空简单题查看答案及解析
There are________to show that a new, different city is coming out of its dark past.
A. signals B. marks C. signs D. symbols
高三英语单项填空中等难度题查看答案及解析
Each of us can live strong,healthy,energetic lives for a long time to come.The key?Actually,there are many of them.
Eat fewer calories,but more food
Slimming down can help prevent disease,and cutting way back on the amount you eat may even slow the aging process.When nutrition researchers invited themselves over for dinner in kitchens across the globe-from Greece to Japan to the state of Pennsylvania--they discovered a stomach-satisfying secret to good health:Pile your plate high with vegetables and fruits,add respectable parts of beans and whole grains,and ignore high-calorie food like cheeseburgers,cream sauces,and fatty meats.
Use exercise as an anti-aging vaccine
Exercise can help you gain a better quality of life as you age.It's no secret that physical activity strengthens muscles,burn calories,and puts a happy bounce in your step.But recently,researchers discovered a new,extra benefit:Exercise acts as a powerful way against the aging process itself. When exercise physiologists put healthy people aged 60 to 85 on Weight-training programs for six months then tested them for signs of free-radical(自由基) damage,they were surprised by the results.By the end of the study,low-intensity exercisers had a drop in free-radical damage,while high-intensity exercisers had a slight increase.
Find something interesting to do
Life is always busy no matter what your age.But the truth is,when people are retired,time usually does become more available for adults after 60.With this time come choices.The easy one is merely to relax:watch more TV,eat out more often,talk on the phone as much as you want.The better choice? Discover something more meaningful to devote yourself to and do it wholeheartedly.
1.Which of the following is what you should eat more?
A.Fatty meats. B.Whole grains.
C.Cream sauces. D.Cheeseburgers.
2.The new discovery of exercise probably is that__________.
A.it can help you live a better life
B.it can strengthen muscles
C.it can burn calories
D.it can prevent aging process
3.When do you have more free time according to this text?
A.In your fifties. B.Beyond sixty.
C.Over seventy D.Before sixty.
4.The best title of this text should be "_______".
A.How to Keep a Balanced Diet
B.The Importance of Your Health
C.Keys to living Longer and Better
D.Hobbies making Your Healthy
高三英语阅读理解中等难度题查看答案及解析
Picasso paintings regularly sell for millions of dollars, making it unlikely that the majority of art lovers will ever own a work by the famous Spanish painter. But Care International, a Paris-based nonprofit is offering individuals around the world the chance to acquire a Picasso original for just $111 and contributes to a worthy cause at the same time.
As Caroline Elbaor reports for artnet News, Aider les Autres is offering tickets for Nature Morte, a 1921 Picasso painting describing a newspaper and a glass of absinthe(苦艾酒). The painting, which is on display at the Picasso Museum in Paris, has been valued at SI. I million. But one lucky winner will be able to obtain the painting for a mere small amount of that price.
By selling the Picasso painting at an extremely discounted rate, Aider les Autres hopes to raise a lot of money for Care International. Around 200, 000 rale tickets (抽奖券)are available for purchase, meaning the organization will be able to raise up to $22 million. Some of the money will be used to buy the painting and cover other costs, but the majority will be donated to the charity.
Care International plans to use the donated money to build and restore wells, washing facilities and toilets in Cameroon, Madagascar and Morocco. Having easy access to clean water not only reduces the risk of water borne diseases, but also reduces the time that people and particularly women and girls have to spend walking to clean water sources.
“Besides the huge waste of time, women and girls are at risk as they walk alone along remote paths and tracks,” Aider les Autres explains. “Girls are also more likely to miss school because of lack of hygiene (卫生). By providing clean water, we will increase girls' attendance by many thousands.”
1.Where are art lovers likely to get a Picasso original at a very low price?
A.From the lucky winner. B.From Caroline Elbaor.
C.From the Picasso Museum. D.From Care International.
2.What will most money from raffle tickets be used to do?
A.Buy tickets for art overs.
B.Buy the painting Nature Morte.
C.Contribute to charitable projects.
D.Give away to the lucky winner.
3.Why will Care International build wells in Morocco?
A.To promote its status. B.To store more clean water.
C.To improve people’s health. D.To increase girls 'learning time.
4.Where is this text most likely from?
A.A personal diary. B.A news report.
C.A book review. D.A science fiction novel.
高三英语阅读理解中等难度题查看答案及解析
The reason why so many people sit before the television tonight is that there will be a______ show.
A. living B. live
C. alive D. lived
高三英语单项填空中等难度题查看答案及解析
When e-mail first came into general use about twenty years ago, there was a lot of talk about the arrival of the paperless office. However, it seems that e-mail has yet to revolutionize office communication. According to communications analyst Richard Metcalf, some offices have actually seen an increase in paper as a result of e-mail. “Information in the form of e-mail messages now floods our computer screens. These messages can be sent so quickly that memos tend to be distributed in the hundreds. For those secretaries whose bosses ask them to print out all their e-mails and leave them in their in-trays, this means using up a great deal of paper every month,” Metcalf says.
Metcalf has found that because some e-mails get lost in cyberspace, important documents are increasingly likely to be asked by clients and colleagues to send all important documents both by e-mail and by fax. This highlights a further potential problem with e-mail in today’s offices ─ it is taking up time rather than saving it. “With e-mail, communication is much easier, but there is also more room for misunderstandings,” says psychologist Dr David Lewis. Generally, much less care is taken with e-mails than with letters or faxes and the sender will probably print the document and reread it before putting it in an envelope or sending it by fax.
More worrying is still the increasing misuse of e-mail for sending “flame-mail” ─inappropriate e-mail messages. Recent research in several companies suggests that aggressive communications like this are on the increase. E-mail has become the perfect medium for conveying workplace dissatisfaction because it is so instant.
E-mail can also be a problem in other ways. Staffs all too often make the mistake of thinking that the contents of the e-mail, like things said over the phone, are private and not permanent. But it is not only possible for an employer to read all your e-mails, it is also perfectly legal. E-mail messages can be traced back to their origin for a period of at least two years, so you might want to rethink e-mailing your dissatisfaction about your boss to your friends. The advice is to keep personal e-mails out of the office.
(Note: Answer the questions or complete the statements in NO MORE THAN 12 WORDS)
1.The promise of paperless office has not come true in many offices mainly because many secretaries are asked to _____________.
2.Why has e-mailing taken up time rather than saved it?
3.There is an increasing concern that e-mails are misused by some employees to express _____________.
4.It is advised that employees should not use company e-mails as a way of ___________.
高三英语其他题中等难度题查看答案及解析