Scientists have been the temperature of the o...

Scientists have been 　　　　 the temperature of the oceans to see how it changes over a period of time.

A. predicting　　 B. controlling

C. increasing　　 D. charting

高二英语单项填空简单题查看答案及解析

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

Scientists used to explore探测on the surface of the ocean. Now they are exploring below the surface, too. They want to know about ocean water and the plant and animal life deep in the ocean.

In 1934 the scientist William Beebe dived 3 000 feet below the surface in a hollow steel ball. In 1935 August Piccard dived 10330 feet. In 1960 his son Jean dived to a depth of 35 800 feet. All these early dives were deep. But the divers could not stay down for very long. They had to come back up to the surface after a few seconds. Scientists needed to stay down longer to study life below surface. Gradually they succeeded. Cousteau, a Frenchman, was able to keep men down to a depth of 90 feet for a week.

Now scientists are developing even better equipment. With this new equipment，men can stay below the surface for days or even weeks. In 1962 Cousteau set up a research station 35 feet below the surface. Then，in 1964，he set up another station on the ocean floor of the Red Sea. This was the first undersea station to operate without help from the surface.

Many countries are now studying undersea living. The former Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet down on the ocean floor off the Virgin Islands. In 1970 five men lived there for two weeks. Then a team of five women scientists stayed in the laboratory. Next came other teams of men. All were there to explore the ocean depths and to make plans for the use of its resources. Scientists hope to find enough mineral，vegetable，and animal wealth there to provide food for the entire world.

1.In order to______ ，scientists are exploring below the surface of the ocean.

A. know about the ocean water deep in the ocean

B. stay down longer to study life of the plant and animal below the surface

C. know about the plant and animal life deep in the ocean

D. both A and C

2.Who made the deepest dive______

A. William Beebe.

B. August Piccard.

C. Jean Piccard.

D. Cousteau.

3.Which of the following statements is true____

A. The early divers could not stay down for very long.

B. Up to now only five women scientists have stayed in the undersea laboratory.

C. The purpose of setting up the undersea laboratories is to make plans for the use of the resources in the ocean.

D. None of the above is true.

高二英语阅读理解中等难度题查看答案及解析

The scientists have made an exhaustive study of the virus _______ many people have been inflected.

A. to which　　　　　 B. in which　　　　　 C. with which　　　 D. for which

高二英语单项填空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（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

Scientists have always been interested in the high level of organization in ant societies. American researchers have watched ants build life-saving rafts to keep afloat during floods. They also have recorded how ants choose their next queen — the female whose job is to produce eggs.

New technology is helping to improve researchers’ understanding of the insects. But there is still a lot to be learned.

Fire ants living in Brazilian forests are perfectly at home in an environment where flooding is common. To save themselves, the insects connect their legs together and create floating rafts. Some ant rafts can be up to 20 centimeters wide.

David Hu is an engineer with the Georgia Institute of Technology, also known as Georgia Tech, saying, "If you have 100 ants, which means 600 legs, 99 percent of those legs will be connected to a neighbor. So they’re very, very good at keeping this network."

David Hu and other Georgia Tech researchers wanted to study ants and the secret of their engineering. They froze ant rafts and then looked at them with the help of computed technology, or CT images. The pictures showed that larger ants serve in central positions to which smaller ants hold. The larger ants create pockets of air that keep the insects afloat.

Scientists say small robots or materials that can change shape could be programmed in a similar way, working towards a shared goal.

Researchers at North Carolina State University are also studying ants. They examined how Indian jumping ants choose the leader of the colony when they lose their top female or queen.

1.The author takes fire ants as an example to tell us ________.

A. how ants survive　　 B. how ants seek food

C. how ants communicate　　 D. how ants live together

2.What can we know from what David Hu said in paragraph 4?

A. Ants know the way to keep in touch in the river.

B. Ants know the way to join together closely.

C. Ants know the way to look for each other.

D. Ants know the way to build a large raft.

3.Why did the larger ants serve in central positions in their ant rafts?

A. To stress their importance.　　 B. To help all the ants float.

C. To fight against the enemies.　　 D. To defend their top female.

4.What ideas do the ants give us according to the passage?

A. We can use similar-shaped machines in flooding areas.

B. We can combine small robots or materials into larger ones.

C. Small and shape-changeable things might work just like ants do.

D. Small robots or materials in the shape of ants can be made.

高二英语阅读理解中等难度题查看答案及解析

Scientists have always been interested in the high level of organization in ant societies. American researchers have watched ants build life-saving rafts to keep afloat during floods. They also have recorded how ants choose their next queen — the female whose job is to produce eggs.

New technology is helping to improve researchers’ understanding of the insects. But there is still a lot to be learned.

Fire ants living in Brazilian forests are perfectly at home in an environment where flooding is common. To save themselves, the insects connect their legs together and create floating rafts. Some ant rafts can be up to 20 centimeters wide.

David Hu is an engineer with the Georgia Institute of Technology, also known as Georgia Tech, saying, "If you have 100 ants, which means 600 legs, 99 percent of those legs will be connected to a neighbor. So they're very, very good at keeping this network. "

David Hu and other Georgia Tech researchers wanted to study ants and the secret of their engineering. They froze ant rafts and then looked at them with the help of computed technology, or CT images. The pictures showed that larger ants serve in central positions to which smaller ants hold. The larger ants create pockets of air that keep the insects afloat.

Scientists say small robots or materials that can change shape could be programmed in a similar way, working towards a shared goal.

Researchers at North Carolina State University are also studying ants. They examined how Indian jumping ants choose the leader of the colony when they lose their top female or queen.

1.The author takes fire ants as an example to tell us _____ .

A. how ants seek food　　 B. how ants survive

C. how ants communicate　　 D. how ants live together

2.What can we know from what David Hu said in paragraph 4?

A. Ants know the way to join together closely.

B. Ants know the way to keep safe in the river.

C. Ants know the way to look for each other.

D. Ants know the way to build a large raft.

3.Why did the larger ants serve in central positions in their ant rafts?

A. To stress their importance.　　 B. To help all the ants float.

C. To fight against the enemies.　　 D. To defend their top female.

4.What ideas do the ants give us according to the passage?

A. We can use similar-shaped machines in flooding areas.

B. We can combine small robots or materials into larger ones.

C. Small and shape-changeable things might work just like ants do.

D. Small robots or materials in the shape of ants can be made.

高二英语阅读理解困难题查看答案及解析