For years scientists have been worried about ...

For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants（污染物）can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb（吸收）or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and healthier place.

1.Generally speaking, indoor air pollution may be more harmful than the air outside because 　　　　 .

A．indoor air pollution can often make people seriously ill

B．man-made building materials give off dangerous gases

C．there may be more harmful gases outside the buildings

D．the air indoors is polluted, which is very harmful

2.Some kind of indoor pollution can be found in 　　　　 .

A．every modern house B．every old house

C．all kinds of houses 　　 D．all kinds of offices

3.The indoor air pollution is caused by 　　　　 .

A．the limit of the flow of air between inside and outside

B．the building way that the builders want to save energy

C．the building things that are made of man-made materials

D．the man-made building materials and the limit of air-flow

4.The reason why we should use different kinds of plants to clean the air is that

A．plants can let out all kinds of pollutants indoors

B．plants may take in more oxygen （氧气）which people need

C．plants can absorb all kinds of harmful indoor chemicals

D．plants can make our houses prettier and more healthy

高二英语阅读理解中等难度题查看答案及解析

For years scientists have been worrying about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants can cause breathing disorders, diseases of blood and even cancer, Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they built buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and through its tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square metres of space. Studies of different plants show that each absorbs different chemicals.

So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

1.Generally speaking, indoor air pollution may be more harmful than the air outside because ________.

A．indoor air pollution can make a person seriously ill

B．man - made building materials give off dangerous gases

C．there may be more harmful gases outside the buildings

D．the air indoors is polluted, which is very harmful

2.Some kind of indoor pollution can be found in ________

A. every modern house

B. every old house

C. all kinds of houses

D all kinds of offices

3. The indoor air pollution is caused by ______

A. the limit of the flow of air between inside and outside

B. the building way that the builders want to save energy

C. the building things that are made of man-made materials

D. the man-made building materials and the limit of airflow

4.The reason why we should use different kinds of plants to clean the air is that _______

A. plants can let out all kinds of pollutants indoors

B. plants may take in more oxygen which people need

C. plants can absorb all kinds of harmful indoor chemicals

D. plants can make our houses prettier and more healthy

高二英语阅读理解中等难度题查看答案及解析

For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

1.Generally speaking, indoor air pollution may be more harmful than the air outside because ______.

A．indoor air pollution can often make people seriously ill

B．man-made building materials give off dangerous gases

C．there may be more harmful gases outside the buildings

D．the air indoors is polluted, which is very harmful

2.Some kind of indoor pollution can be found　in______．

Ａ．every modern house　         B．every old house

C．all kinds of houses           D．all kinds of offices

3.The indoor air pollution is caused by ______.

A．the limit of the flow of air between inside and outside

B．the building way that the builders want to save energy

C．the building things that are made of man-made materials

D．the man-made building materials and the limit of air-flow

4.The reason why we should use different kinds of plants to clean the air is that ______.

A．plants can let out all kinds of pollutants indoors

B．plants may take in more oxygen which people need

C．plants can absorb all kinds of harmful indoor chemicals

D．plants can make our houses prettier and more healthy

高二英语阅读理解中等难度题查看答案及解析

For years scientists have been worried about the effects of air pollution on the earth's natural conditions. Some believe the air inside many houses may be more dangerous than the air outside.

Most scientists agree that every modern house has some kind of indoor pollution. People began to notice the problem in the early 1970s. When builders began making houses and offices, they did not want to waste energy. To do this they built buildings that limited the flow of air between inside and outside. They also used man－made building materials which are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building green plants.

Scientists believe that a plant's leaves absorb the pollutants (污染物). In exchange the plant lets out oxygen through its leaves. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants.

1.Indoor air pollution may be more dangerous than the air outside mainly because 　　　　 .

A. the building are too high

B. the flow of air indoor is limited

C. the building materials are harmful

D. people don't want to waste energy

2.Some kind of indoor pollution can be found in 　　　　 .

A. all kinds of offices B. all kinds of houses

C. every modern house 　 D. every old house

3.In the last paragraph the word“ absorb” may mean 　　　　 .

A. take in B. bring up C. give out D. turn into

4.Scientists believe that plants can　　　　 .

A. change oxygen into pollutants

B. absorb all the pollutants

C. make your houses more prettier

D. absorb pollutions and let out oxygen

5.According to the last paragraph, we should 　　　　 to clean the air.

A. plant all kinds of plant

B. plant more trees.

C. have the same kind of plant

D. have different kinds of plants

高二英语阅读理解中等难度题查看答案及解析

The effects of air pollution on natural conditions have been a disturbing problem for many years. Some scientists hold the view that the air inside houses may be more dangerous than the air outside. It may even be one hundred times worse.

Most scientists agree that every modern house has some kind of indoor pollution, which can cause a person to feel tired, to suffer eye pain, headache and other problems. Believe it or not, some pollutants can cause breathing diseases of blood and even cancer.

What made us feel relieved is that there’s growing concern about the problem now. It is true that when builders began constructing houses and offices they did not want to waste energy. To do this they built buildings that prevented or limited the flow of air between inside and outside. For the same purpose, man-made building materials were employed to build houses, which are now known to let out some harmful gases.

Facing the serious challenge, scientists have been searching for a way to handle the problem. To everyone’s delight, they discovered a natural pollution control system for building—green plants, though they do not really know how plants control air pollution. Scientists suppose that a plant’s leaves absorb or take in the pollutants and in exchange gives out oxygen through its leaves and tiny organizations on its roots. Therefore they recommend that all buildings should have one large plant or several small plants inside for every nine square meters of space. Because studies indicate that different plants absorb different chemicals, the most effective way to clean the air is to use different kinds of plants. In conclusion, having green plants inside your house can make it a prettier and healthier place. Why not try?

1.Which of the following statements is TRUR?

2.According to scientists, some kind of indoor pollution can be found in ________.

3.What does the underlined part “To do this” refer to in Para3?

4.The reason why we should use different kinds of plants to clean the air is that ___.

高二英语阅读理解困难题查看答案及解析

For more than twenty years scientists have been seeking to understand the mystery of the “sixth sense” of direction. By trying out ideas and solving problems one by one, they are now getting closer to one answer. One funny idea from observing animals in nature is that animals might have a built-in compass.

Many birds migrate(迁徙）twice a year between their summer homes and winter homes. Some of them fly for thousands of kilometers and mostly at night. Experiments have shown that some birds can recognize star patterns. But they can keep on course even under cloudy skies. How can they do that? A common bird that does not migrate but is great at finding its way home is the horning pigeon(鹤子）and they have been widely studied. One interesting experiment was to attach little magnets (磁铁，磁场）to the birds’ heads to block their magnetic sense — just as a loud radio can keep you from hearing a call to dinner. On sunny days, that did not fool the pigeons. Evidently they can use the　 sun to tell which way they are going. But on cloudy days, the pigeons with magnets could not find their way. It was as if the magnets had blocked their magnetic sense. Similar experiments with the same kind of results were done with honeybees.

In spite of the experiments, the idea of an animal compass seemed pretty extraordinary. How would animals get the magnetic stuff for a compass? An answer came from an unexpected source, A scientist was studying bacteria that lived in the mud of ponds. He found　 accidentally little rod-like bacteria that all swam together in one direction 一 north. In fact, the bacteria had made themselves into little magnets that could line up with the earth’s magnet.

The big news was that a living thing, even a simple bacterium，can make magnetite. That led to a search to see whether animals might have it. By using a special instrument, scientists were able to find magnetite in bees and birds，and even in fish. In each animal, except for the bee, the magnetic stuff was always in or close to the brain.

Thus, the idea of a built-in animal compass began to seem reasonable.

1.The main purpose of this passage is to 　　　　　 .

A. explain how the animal compass was invented

B. answer how an animal would get the magnetic stuff for a compass

C .introduce a famous experiment

D. prove the idea that animals might have a built-in compass

2.Which of the following can we infer from Paragraph 3?

A. The bacteria magnetic sense seemed to be the same as the earth’s.

B. The earth itself is a big magnet with which something magnetic might lines up

C. Little rod-like bacteria were found to swim north together through experiments.

D. Migrant birds can easily lose their way because of lacking magnetie.

3.The underlined words “keep on course” in the second paragraph means“

A.stay in the correct flying route

B.lose one’s way

C.remain calm

D.recognize star patterns

4.Where is probably the built-in magnet for a fish according to the scientists?

A.Close to its stomach. B.In its heart.

C.Far from its brain. 　 D.Inside its head.

高二英语听力第三部分中等难度题查看答案及解析

For hundreds of years, people have been wondering about the strange places that they seem to visit in their sleep.1.However, they have been valued as necessary to a person’s health and happiness. Historically people thought dreams contained messages from God. It was only in the twentieth century that people started to study dreams scientifically believing that they tell about a person's character.2.He believed that dreams allow a person to express fantasies or fears, which would be socially unacceptable in real life.

The second theory to become popular was Carl Jung's compensation theory. Jung, a former student of Freud, said that the purpose of a dream is not to hide something, but rather to communicate it to the dreamer.3.Thus, people who think too highly of themselves may dream about falling; those who think too little of themselves dream of being heroes.

Using more recent research, William Domhoff from the University of California found that dreaming is a mental skill that needs time to develop in humans. 4.Until they reach age five, they cannot express very well what their dreams are about. Once people become adults, there is little or no change in their dreams. The dreams of men and women differ. For instance, the characters that appear in the dreams of men are often other men, and often involve physical aggression.

The meaning of dreams continues to be difficult to understand.5.If you dream that a loved one is going to die, do not panic. The dream may have meaning, but it does not mean that your loved one is going to die.

A. Dreams make up for what is lacking in waking life.

B. However, people should not take their dreams as reality.

C. They have been considered as meaningless nighttime journeys.

D. It gives scientists chances to better understand human mind.

E. Children do not dream as much as adults.

F. They think their mind is trying to tell them something.

G. First, there was Sigmund Freud’s theory.

高二英语七选五困难题查看答案及解析

For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive （善于接受的） to such messages.

Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100 light years of earth. In addition, they will scan (扫视) the entire sky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.

Of the 200 billion stars in the Milky Way galaxy （银河星系）, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life. Based on the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.

However, many scientists wonder whether intelligent （有智力的） life exists on other planets. Some believe that twenty years of searching without any intelligible （可理解的） messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.

Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family in only about five billion years old,　 our galaxy is about 20 billions years old. In that time, some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.

1.According to the passage, how many planets in our galaxy might human beings live?

A. 5 billion　　 B. 10 billion　　 C. 15 billion　　 D. 200 billion

2.The first paragraph in this passage is mainly about ______.

A. where scientists are looking for signs of life on other planets

B. why scientists are looking for signs of life on other planets

C. how scientists are looking for signs of life on other planets

D. when scientists are looking for signs of life on other planets

3. The underlined word “monitor” in the passage means “______”.

A. find　　 B. follow　　 C. study　　 D. form

4. Which of the statements is TRUE based on the information in the passage?

A. The earth is one of the oldest planets in our galaxy.

B. Most scientists believe that there is intelligent life on other planet.

C. Scientists don’t believe that there might be life on other planets.

D. Scientists are trying different ways to find signs of life on other planet.

高二英语阅读理解中等难度题查看答案及解析

For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships travelling through space, on the chance that someone may be receptive to such message.

　Scientists are using powerful radio telescopes to listen to signals from about 1,000 stars, all within 100 light years of Earth. In addition, they will scan the entire sky to "listen" for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.

　Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent are like our sun. Perhaps half of them have a planet like Earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution (进化) of life. Based on the inhabitable (可居住的) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.

　However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.

Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family is only about five billion years old, our galaxy is about 20 billion years old. In that time, some scientists think it is likely that civilization much more advanced than ours have developed. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.

1.According to the passage, how many planets in our galaxy might be inhabitable?

A. 5 billion         B. 10 billion           C. 15 billion           D. 200 billion

2.The first paragraph in this passage is mainly about __________.

A. how scientists are looking for signs of life on other planets

B. why scientists are looking for signs of life on other planets

C. where scientists are looking for signs of life on other planets

D. When scientists are looking for signs of life on other planets

3.The underlined word “monitor” in Paragraph two means “__________”.

A. find              B. follow            C. check           D. form

4.Which of the following is TRUE based on the information in the passage?

A. The earth is the oldest planet in our galaxy.

B. All scientists believe that there is intelligent life on other planets.

C. Scientists are trying different ways to find signs of life on other planets.

D. Scientists will give up the search for signs of life on other planets.

高二英语阅读理解中等难度题查看答案及解析

Most people interviewed said: “We have been warned all about the effects of sunbathing, yet we keep putting ourselves ___ .”

A.at play      B. at risk       C.at peace         D.at work

高二英语单项填空中等难度题查看答案及解析