Much of the water we use comes from snow. Mel...

Much of the water we use comes from snow. Melting snow provides water for rivers, electric power centers and agricultural crops. In the western United States, mountain snow provides up to 75% of all surface water supplies.

Snowfall helps to protect plants and some wild animals from cold, winter weather. Fresh snow is made largely of air trapped among the snow crystals. Because the air has trouble moving, the movement of heat is greatly reduced.

Snow also is known to influence the movement of sound waves. When there is fresh snow on the ground, the surface of the snow takes in, or absorbs, sound waves. However, snow can become hard and flat as it becomes older or if there have been strong winds. Then the snow's surface will help to send back sound waves. Under these conditions, sounds may seem clearer and travel farther.

Generally, the color of snow and ice appears white. This is because the light we see from the sun is white. Most natural materials take in some sunlight. This gives them their color. However, when light travels from air to snow, some light is sent back, or reflected. Snow crystals have many surfaces to reflect sunlight. Yet the snow does take in a little sunlight. It is this light that gives snow its white appearance.

Sometimes, snow or ice may appear to be blue. The blue light is the product of a long travel path through the snow or ice. In simple terms, think of snow or ice as a filter. A filter is designed to reject some substances, while permitting others to pass through. In the case of snow, all the light makes it through if the snow is only a centimeter thick. If it is a meter or more thick, however, blue light often can be seen.

1.How many functions of snow are discussed in the passage?

A．One             B．Two              C．Three            D．Four

2.Why does snowfall help to protect plants from cold?

A．Because snow crystals contain heat.

B．Because snow crystals have air in them.

C．Because snow crystals are easy to blow away.

D．Because snow crystals send out heat when melting.

3.It can be inferred that ______.

A．hard snow is better in protecting wild animals than fresh snow

B．fresh snow is better in sending sound waves than hard snow

C．fresh snow is better in taking in sound waves than hard snow

D．hard snow provides less water than fresh snow

4.The color of snow and ice appears white because snow crystals________.

A．send back none of the sunlight             B．send back all of the sunlight

C．take in most of the sunlight                D．take in some of the sunlight

高二英语阅读理解中等难度题查看答案及解析

The new science of spending comes to a surprising conclusion. How we use our money may____ as much or more than how much we’ve got it.

Money spent on experiences, rather than material goods, ____ more happiness.

Imagine that you wake up tomorrow morning to ___　　 $1 million under your bed .What would you do　　　　 that cash?

The money will probably make you think about one thing _____ all else— yourself. A large amount of research reveals that money 　　 our selfish sides. We will 　　　 much on what that money can do for us alone. Perhaps you are imagining buying a faster car, or even a new house.

But studies show that_______goods often fail to deliver _______ happiness. Fortunately, our ongoing research _______many ways to get more happiness from every dollar you spend. Changing how you spend money can increase your happiness.

But making these_______ needs to challenge some of our ideas of spending. It’s hard not to　　 ______buying a house as a wise investment. But research shows it brings very little happiness. A study in the United States found that homeowners, on average, were no happier than_______.

So, working hard to save money for a house might not be such a good idea _______ it means spending less time with your families and friends. And dozens of studies show that people get more happiness from buying _______ than material things. Experimental purchases—such as trips, concerts and special meals—are more _______connected to our sense of self.

And experiences come with one more______. They tend to bring us______to other people, but more often, material things are enjoyed _____.So social contacts are important to ______ mental and physical health.

1.A. present　　　　　　 B. matter　　　　 C. appear　　　　　　 D. equal

2.A. refers to　　 B. breaks out　 C. holds on　　　　　 D. brings along

3.A. keep　　　　　 B. own　　　 C. discover　　　 D. count

4.A. to　　　　　　　 B. with　　　　　　 C. about　　　　　　　 D. for

5.A. above　　　　 B. below　　　　　 C. before　　　　　　 D. after

6.A. shows　　　　 B. explains　 C. proves　　 D. designs

7.A. depend　　　 B. concentrate　 C. take　　　　 D. look

8.A. mental　　　　　　 B. material　 C. beautiful　　　　 D. clever

9.A. outgoing　　　　　 B. lasting　　 C. willing　　 D. exciting

10.A. invites　　　　 B. offers　　　　　 C. prefers　　　　　　　　 D. follows

11.A. changes　　　　 B. plans　　 C. decisions　　　　　 D. mistakes

12.A. know　　　　 B. view　　　　 C. dream　　　　 D. judge

13.A. buyers　　　　 B. sellers　　　　　 C. builders　　　　 D. renters

14.A. if　　　　 B. how　　　　　 C. unless　　　　　 D. though

15.A. houses　　　　 B. cars　　　　　 C. experiences　　　　　　 D. health

16.A. clearly　　　　 B. hardly　　　 C. generally　　　　 D. deeply

17.A. advantage　　　　 B. conclusion　　　 C. purpose　　　　　　 D. identity

18.A. familiar　　　　 B. close　　　　 C. proper　　　　　　 D. native

19.A. completely　　 B. worldwide　　　 C. secretly　　　　　 D. alone

20.A. gain　　　　　　　 B. damage　　　 C. improve　　　　 D. build

高二英语完形填空中等难度题查看答案及解析

A scientist who developed a way to calculate how much water is used in the production of anything from a cup of coffee to a hamburger was awarded the 2008 Stockholm.Water Prize.

Professor John Anthony Allan of the University of London in Britain won the award for introducing the idea of “virtual water（虚拟水）”,a calculation method that has changed the nature of trade policy and research.

Allan has written seven books and published more than 100 papers.

The Stockholm International Water Institute said this idea is now embedded（埋藏）in the production of foods and industrial products.The institute said Allan's work had made a big effect on global trade policy and research, especially in water-scarce（缺水的）regions.

“The improved understanding of trade and water management issues on local,regional and global scales are of the highest value for the successful and sustainable（可持续的）use of water resources,”it said.

“People do not only use water when they drink it or take a shower,”the institute said.“Behind the morning cup of coffee,there are 140 liters of water that was used to grow,produce,package and ship the beans.”That is about as much water as a person in England uses on average for all daily drinking and household needs.

"For a single hamburger,about 2,400 liters of water are needed.In the USA,the average person uses nearly 7,000 liters of virtual water every day."It said that was more than three times the average use of a Chinese person.

1.Allan was awarded the prize because______.

A. he wrote seven books on trade policy

B. he published more than 100 papers on water management

C. lie found a new kind of water in water-scarce areas

D. he came up with the idea of virtual water

2.Which of the following is TRUE according to the passage?

A. The average American uses about 7,000 liters of water a day.

B. The average Chinese uses nearly 2,300 liters of virtual water a day.

C. An Englishman usually drinks about 140 liters of coffee a day.

D. A hamburger usually contains about 2,400 liters of water.

3.What do we learn about John Anthony Allan from the passage?　　　　　　　　 .

A. He won the 2008 Nobel Prize.

B. He has written over 100 books.

C. He works at the University of London.

D. He lives in the USA.

4.What effect does the idea of virtual water have?

A. It helps us realize the importance of trade.

B. It helps people do successful business.

C. It helps us make use of water scientifically.

D. It tells us how much water we use a day.

高二英语阅读理解困难题查看答案及解析

A scientist who developed a way to calculate how much water is used in the production of anything from a cup of coffee to a hamburger was awarded the 2008 Stockholm Water Prize.

Professor John Anthony Allan of the University of London in Britain won the award for introducing the idea of “virtual water (虚拟水)”, a calculation method that has changed the nature of trade policy and research.

Allan has written seven books and published more than 100 papers.

The Stockholm International Water Institute said this idea is now embedded (埋藏) in the production of foods and industrial products. The institute said Allan’s work had made a big effect on global trade policy and research, especially in water-scarce (缺水的) regions.

“The improved understanding of trade and water management issues on local, regional and global scales are of the highest value for the successful and sustainable (可持续的) use of water resources,” it said.

“People do not only use water when they drink it or take a shower,” the institute said. “Behind the morning cup of coffee, there are 140 liters of water that was used to grow, produce, package and ship the beans.” That is about as much water as a person in England uses on average for all daily drinking and household needs.

“For a single hamburger, about 2,400 liters of water are needed. In the USA, the average person uses nearly 7,000 liters of virtual water every day.” It said that was more than three times the average use of a Chinese person.

1.Allan was awarded the prize because _______.

A. he wrote seven books on trade policy

B. he published more than 100 papers on water management

C. he found a new kind of water in water-scarce areas

D. he came up with the idea of virtual water

2.Which of the following is TRUE according to the passage?

A. The average American uses about 7,000 liters of water a day.

B. The average Chinese uses nearly 2,300 liters of virtual water a day.

C. An Englishman usually drinks about 140 liters of coffee a day.

D. A hamburger usually contains about 2,400 liters of water.

3.What do we learn about John Anthony Allan from the passage?

A. He won the 2008 Nobel Prize.        B. He has written over 100 books.

C. He works at the University of London.        D. He lives in the USA.

4.What effect does the idea of virtual water have?

A. It helps us realize the importance of trade.

B. It helps people do successful business.

C. It helps us make use of water scientifically.

D. It tells us how much water we use a day.

高二英语阅读理解中等难度题查看答案及解析

The water we drink and use was running short. We all have to learn what to stop wasting water.

One of the step that we should take is to find ways of reusing it. Today in the most large cities, fresh water is used only once and then it runs in waste system. But that is possible to pipe the used water to a purifying factory, there the used water can be treated with chemical materials by the workers so that it can reused. But even if every large city purified and reused it's water, we still would have enough water.

高二英语短文改错中等难度题查看答案及解析

We all know that water is tasteless. But it happens from time to time: you pick up the bottle of water you didn’t finish yesterday, and it tastes strange. Most often, you tend to drop the bottle in the trash bin, believing that the water has gone bad. But is it true?

According to Time, of course not, taste has little to do with quality of water.

According to Time, when water is exposed to the air for 12 hours, carbon dioxide interacts with the H2O in the water, and the pH value lowers slightly. As a result, the water has a different taste.

“But it’s most likely safe to drink,” Norwegian expert Truls Krogh told Science Nordic. “If the water is covered and of good quality to start with, in principle it can last a thousand years. That’s because when water is fresh, it contains little organic matter. As long as water is held in clean glasses or bottles, no pollutants will enter it to harm our health.”

People in countries like the US, the UK and Australia usually drink tap water. According to Time, if tap water is drunk within six months, the chlorine (氯气) in the water will be enough to kill any bacteria and keep it safe to drink.

However, there are also some exceptions. If you accidentally put your fingers into water or store water in unclean containers day after day, microorganism (微生物) will enter the water.

With the help of surrounding temperature, and sunlight streaming through windows, these microorganisms multiply quickly. Sooner or later, the water will be in the charge of the unfriendly bacteria. And if you drink the water too often, then you’re more likely to be ill.

And what about water in plastic bottles? Heat and plastic are a bad combination, US researcher Kellogg Schwab stresses. When plastic bottles are used at high temperatures, they produce a chemical called BPA. BPA is something that affects hormones (荷尔蒙) and research has tentatively linked it to “several health damage, including heart disease and cancer”, Time reported.

Schwab suggests replacing disposable (一次性的) plastic bottles with the refillable containers made of metal or glass to deal with BPA.

1.The purpose of the first paragraph is to ________________.

A. show an example B. draw a conclusion

C. analyze a phenomenon D. introduce a topic

2.Which of the following may Truls Krogh agree?

A. If the water tastes different, we shouldn’t drink it.

B. The water held in a clean container is likely safe to drink.

C. Although kept fresh, water may still have much organic matter.

D. Covered water can last for a thousand years.

3.What can we infer from the passage?

A. BPA does little harm to our health.

B. Tap water is always safe to drink.

C. Microorganisms are easy to produce in the heat.

D. Disposable plastic bottles have been banned already.

4.What can be the best title of the passage?

A. Why Water is Tasteless B. How to Get Clean Water

C. Does Water Really Go Bad? D. Learn to Protect Water

高二英语阅读理解困难题查看答案及解析

The new science of spending comes to a surprising conclusion: How we use our money may ________as much or more than how much we’ve got.

Money spent on experiences, rather than material goods, _______ more happiness. Imagine that you wake up tomorrow morning to _________ ＄1 million under your bed . What would you do ________ that cash?

The money will probably make you think about one thing _______ all else—yourself. A large amount of research reveals that money ________ our selfish sides. We will _________ much on what that money can do for us alone, Perhaps you are imagining buying a faster car, or even a new house,

But studies show that _______ goods often fail to deliver ________ happiness, Fortunately ,our ongoing research _______ many ways to get more happiness from every dollar you spend, Changing how you spend money can increase your happiness.

But making these _______needs to challenge some of our ideas of spending. It’s hard not to ________ buying a house as a wise investment（投资）, But new research shows it brings very little happiness, A study in the United States found that homeowners, on average , were no happier than ________ .

So, working hard to save money for a house might not be such a good idea _______ it means spending less time with your families and friends.

And dozens of studies show that people get more happiness from buying ______ than material things. Experiential purchases --- such as trips, concerts and special meals--- are more _________connected to our sense of self.

And experiences come with one more _________ -- they tend to bring us _______ to other people, but more often, material things are enjoyed_________ . So social contacts are important to ________ mental and physical health.

1.A. present　　 B. equal　　 C. appear　　 D. matter

2.A. carries along　　 B. breaks out　　 C. holds on　　 D. brings along

3.A. keep　　 B. own　　 C. discover　　 D. count[

4.A. with　　 B. to　　 C. about　　 D. for

5.A. above　　 B. below　　 C. before　　 D. after

6.A. shows　　 B. explains　　 C. affects　　 D. designs

7.A. depend　　 B. concentrate　　 C. take　　 D. look

8.A. mental　　 B. beautiful　　 C. material　　 D. clever

9.A. outgoing　　 B. exciting　　 C. willing　　 D. lasting

10.A. invites　　 B. offers　　 C. prefers　　 D. follows

11.A. plans　　 B. changes　　 C. decisions　　 D. mistakes

12.A. know　　 B. view　　 C. dream　　 D. judge

13.A. buyers　　 B. sellers　　 C. builders　　 D. renters

14.A. if　　 B. how　　 C. unless　　 D. though

15.A. houses　　 B. cars　　 C. experiences　　 D. health

16.A. clearly　　 B. rarely　　 C. generally　　 D. closely

17.A. benefit　　 B. conclusion　　 C. purpose　　 D. identify

18.A. familiar　　 B. close　　 C. proper　　 D. native

19.A. completely　　 B. worldwide　　 C. secretly　　 D. alone

20.A. gain　　 B. improve　　 C. damage　　 D. cover

高二英语完形填空困难题查看答案及解析

As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.

A. the; a　　 B. a; a

C. /; a　　 D. /; the

高二英语单项填空中等难度题查看答案及解析

It seemed that the water led to cholera. John Snow looked into the s 　 1.　 of the water for these two streets. He found that it came from the river, 　　 2. had been polluted by the dirty water from London. Immediately John Snow told the astonished people in Broad Street to r 3.　　 the handle from the water pump so it could not be used. Soon the disease began to slow　 4. .

John Snow had shown that cholera was spread by germs and not in a cloud of gas. 　 5.　 addition, he found two other deaths in another part of London that were concerned with the Broad Street outbreak. A woman, who had moved away from Broad Street, liked the water so much that she had had it delivered from the pump to her house every day. Both she and her daughter, who often visited her, 6.　 (死掉)of cholera after drinking the water. With this extra　 7.　 （证据） , John Snow was able to announce with certainty that polluted water carried the disease.

To p 8.　 this from happening again, John Snow suggested that all water supplies be examined and new methods of 　　 9.　 （处理）with polluted water be found. The water companies were also instructed not to expose people to polluted water anymore. Finally “King Cholera” was d 　　 10.　　

高二英语其他题中等难度题查看答案及解析

Do you still remember the use we _______ the material?

高二英语单项填空中等难度题查看答案及解析