Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.
The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels(分贝)measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.
Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
1. According to the passage, which of the following is increasingly dangerous to sea creatures?
A. The man-made noises. B. The noises made by themselves.
C. The sound of earthquakes. D. The sound of the ice-breaking.
2. Which of the following is discussed in the third paragraph?
A. Different places with different types of noises.
B. The very human ears sensitive to all types of noises.
C. The ocean animals' reaction to noises.
D. The same noise measured differently on land and in the ocean.
3.We can know from the passage that many researchers think that the noise limit of one hundred twenty decibels would _____.
A. prevent them from doing their research work
B. benefit them a lot in their research work
C. do good to their health
D. increase the industrial output
4. According to the passage, what will scientists most probably do in the future?
A. They will try their best to decrease noise.
B. They will work hard to cut down noise pollution.
C. They will study the effect of different noises.
D. They will protect animals from harmful noises.
高三英语阅读理解中等难度题
Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.
The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have suggested setting a noise limit of one hundred and twenty decibels in the oceans. They have observed that noises at that level can frighten and confuse whales(鲸鱼).
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals.
The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.
Many researchers whose work depends on ocean sounds are against a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists don't think that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
1.According to the passage, natural sounds include all of the following EXCEPT________.
A.sounds made by animals themselves
B.ocean drilling
C.underwater earthquakes
D.the breaking of ice fields
2.Which of the following is true of whales?
A.They won't be confused by noises.
B.They are deaf to noises.
C.Their ability to reproduce will be lowered by highlevel noises.
D.Their hearing will be damaged by highlevel noises.
3.According to the passage, what will scientists most probably do in the future?
A.They will work hard to reduce ocean noise pollution.
B.They will protect sea animals from harmful noises.
C.They will try to set a limit of 120 decibels.
D.They will study the effect of ocean noise pollution.
高三英语阅读理解中等难度题查看答案及解析
Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.
The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have suggested setting a noise limit of one hundred and twenty decibels in the oceans. They have observed that noises at that level can frighten and confuse whales(鲸鱼).
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals.
The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected(被感染的).
Many researchers whose work depends on ocean sounds are against a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists don’t think that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
1.According to the passage, which of the following is increasingly dangerous to sea creatures?
A. The sound of cars. B. The sound of voices.
C. Man-made noise pollution. D. The sound of steps.
2.According to the passage, natural sounds include all of the following EXCEPT________.
A. sounds made by animals themselves B. ocean drilling
C. underwater earthquakes D. the breaking of ice fields
3.Which of the following is discussed in the third paragraph?
A. The same noise level produces a different effect on land and in the ocean.
B. Different places may have different types of noises.
C. The decibel is not a right unit (单位) for measuring underwater noise.
D. Different ocean animals may have different reactions to noises.
4.Which of the following is true of whales?
A. They won't be confused by noises.
B. They are deaf to noises.
C. Their ability to reproduce will be lowered by high-level noises.
D. Their hearing will be damaged by high-level noises.
5.According to the passage, what will scientists most probably do in the future?
A. They will work hard to reduce ocean noise pollution.
B. They will protect animals from harmful noises.
C. They will try to set a limit of 120 decibels.
D. They will study the effect of ocean noise pollution.
高三英语阅读理解中等难度题查看答案及解析
Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.
The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels(分贝)measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.
Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
1. According to the passage, which of the following is increasingly dangerous to sea creatures?
A. The man-made noises. B. The noises made by themselves.
C. The sound of earthquakes. D. The sound of the ice-breaking.
2. Which of the following is discussed in the third paragraph?
A. Different places with different types of noises.
B. The very human ears sensitive to all types of noises.
C. The ocean animals' reaction to noises.
D. The same noise measured differently on land and in the ocean.
3.We can know from the passage that many researchers think that the noise limit of one hundred twenty decibels would _____.
A. prevent them from doing their research work
B. benefit them a lot in their research work
C. do good to their health
D. increase the industrial output
4. According to the passage, what will scientists most probably do in the future?
A. They will try their best to decrease noise.
B. They will work hard to cut down noise pollution.
C. They will study the effect of different noises.
D. They will protect animals from harmful noises.
高三英语阅读理解中等难度题查看答案及解析
Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.
The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels (分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.
Some scientists have suggested setting a noise limit of one hundred and twenty decibels in the oceans. They have observed that noises at that level can frighten and confuse whales(鲸鱼).
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals.
The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales' ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected(被感染的).
Many researchers whose work depends on ocean sounds are against a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.
Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists don’t think that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
1.According to the passage, which of the following is increasingly dangerous to sea creatures?
A. The sound of cars.
B. The sound of voices.
C. Man-made noise pollution.
D. The sound of steps.
2.According to the passage, natural sounds include all of the following EXCEPT________.
A. sounds made by animals themselves B. ocean drilling
C. underwater earthquakes D. the breaking of ice fields
3.Which of the following is discussed in the third paragraph?
A. The same noise level produces a different effect on land and in the ocean.
B. Different places may have different types of noises.
C. The decibel is not a right unit (单位) for measuring underwater noise.
D. Different ocean animals may have different reactions to noises.
4. Which of the following is true of whales?
A. They won't be confused by noises.
B. They are deaf to noises.
C. Their ability to reproduce will be lowered by high-level noises.
D. Their hearing will be damaged by high-level noises.
5.According to the passage, what will scientists most probably do in the future?
A. They will work hard to reduce ocean noise pollution.
B. They will protect animals from harmful noises.
C. They will try to set a limit of 120 decibels.
D. They will study the effect of ocean noise pollution.
高三英语阅读理解中等难度题查看答案及解析
Scientists are building the world’s first thinking robot.It’s true.Some say machines that walk, speak and feel will have been made by 2020.Kismet is the name of a robot which scientists have built this year at the Massachusetts Institute of Technology (MIT)
Kismet is different from traditional robots because it can show human emotions.Its eyes, ears and lips move to show when it feels happy, sad or bored.Kismet is one of the first robots of a new generation that look like human beings and can imitate human feelings.
Some people say that by 2020 we will have created robots with brains similar to those of adult human beings.These robots will be designed to look like people to make them more attractive and easier to sell.What kind of jobs will they do? In the future, robots like Robonaut, a robot invented by NASA, will be doing dangerous jobs, like repairing space stations.They will also be doing more and more of the household work for us.In Japan, scientists are designing robots that will entertain people by dancing and playing the piano.
Meanwhile, people who worry about the future are wondering whether robots will become monsters? Will people themselves become increasingly like robots? Experts predict that more and more people will be wearing micro-computers connected to the Internet in the future.People will have microchips in various parts of their body, which will connect them to a wide variety of small machines.Perhaps we should not exaggerate(夸大) the importance of technology, but one may wonder whether, in years to come, we will still be falling in love, and whether we will feel pain.
Who knows?
1.Kismet is different from traditional robots because______.
A.it is made in the MIT, USA B.it is able to express its own feelings
C.it is the first modern robot D.it is able to show human feelings
2.Possibly, robots will be able to ______in about ten years from now.
A.think like human beings B.do all kinds of jobs for us
C.imitate human feelings D.become dangerous monsters
3.The underlined word “one” can be best replaced by_____.
A.some experts B.the writer himself
C.some scientists D.people in general
4.It can be inferred from this passage that_______.
A.robots will take the place of human beings in the future
B.the importance of technology has been exaggerated
C.scientist have designed different kinds of robots
D.robots might be a helper or a danger.
高三英语阅读理解中等难度题查看答案及解析
Scientists are building the world’s first thinking robot. It’s true. Some say machines that walk, speak and feel will have been made by 2020.Kismet is the name of a robot which scientists have built this year at the Massachusetts Institute of Technology (MIT)
Kismet is different from traditional robots because it can show human emotions. Its eyes, ears and lips move to show when it feels happy, sad or bored. Kismet is one of the first robots of a new generation that look like human beings and can imitate human feelings.
Some people say that by 2020 we will have created robots with brains similar to those of adult human beings. These robots will be designed to look like people to make them more attractive and easier to sell. What kind of jobs will they do? In the future, robots like Robonaut, a robot invented by NASA, will be doing dangerous jobs, like repairing space stations. They will also be doing more and more of the household work for us. In Japan, scientists are designing robots that will entertain people by dancing and playing the piano.
Meanwhile, people who worry about the future are wondering whether robots will become monsters? Will people themselves become increasingly like robots? Experts predict that more and more people will be wearing micro-computers connected to the Internet in the future. People will have microchips in various parts of their body, which will connect them to a wide variety of small machines. Perhaps we should not exaggerate(夸大) the importance of technology, but one may wonder whether, in years to come, we will still be falling in love, and whether we will feel pain.
Who knows?
1.Kismet is different from traditional robots because______.
A. it is made in the MIT, USA B. it is able to express its own feelings
C. it is the first modern robot D. it is able to show human feelings
2.Possibly, robots will be able to ______in about ten years from now.
A. think like human beings B. do all kinds of jobs for us
C. imitate human feelings D. become dangerous monsters
3.The underlined word “one” can be best replaced by_____.
A. some experts B. the writer himself C. some scientists D. people in general
4.It can be inferred from this passage that_______.
A. robots will take the place of human beings in the future
B. the importance of technology has been exaggerated
C. scientist have designed different kinds of robots
D. robots might be a helper or a danger.
高三英语阅读理解简单题查看答案及解析
“The world's oceans are slowly getting more acidic(酸的),” say scientists. The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere.
The lowering of the waters' PH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century.
These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. “This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere,” said Dr Caldeira. And we predict the amount of future acidity will be greater than anything we have seen over the last several hundred million years.
However, it is not absolutely clear what that means for ocean life. Most organisms live near the surface, where the greatest PH change would be expected to occur, but deep-ocean life forms may be more sensitive to PH changes. Coral reefs and other organisms whose shells contain calcium carbonate(碳酸钙) may be particularly affected if the water's acidity levels keep going up, the team predict. They could find it much more difficult to build these structures in water with a lower PH.
In recent years some people have suggested storing carbon dioxide from power station in the deep ocean as a way of dealing with global warming. But Dr Caldeira said that such a strategy should now be re—considered. “Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing——because in releasing CO2 into the atmosphere we warm the planet, and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.”
1.The ocean is becoming more acidic due to________.
A. the lower water PH value B. the warming atmosphere
C. the higher level of CO2 in the air D. the increasing use of oil fuels
2.According to Dr Caldeira,________.
A. ocean absorption of carbon dioxide is a good thing
B. more oil fuels will be used in the near future
C. scientists may predict climate changes with computer models
D. the future situation of the amount of acidity is extremely serious
3.If the water's acidity level keeps rising,________.
A. ocean life whose structures contain calcium carbonate may be affected
B. the water's PH value will become higher and higher
C. organisms living near the surface are more sensitive to PH changes
D. some disastrous events will occur more often than before
4.Most experts once believed storing carbon dioxide in the ocean would reduce________.
A. the CO2 absorbed by the ocean B. the amount of greenhouse warming
C. the acidity of the ocean D. the gradual release of CO2
高三英语阅读理解中等难度题查看答案及解析
“The world's oceans are slowly getting more acidic(酸的),” say scientists. The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere.
The lowering of the waters' PH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century.
These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. “This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere,” said Dr Caldeira. And we predict the amount of future acidity will be greater than anything we have seen over the last several hundred million years.
However, it is not absolutely clear what that means for ocean life. Most organisms live near the surface, where the greatest PH change would be expected to occur, but deep-ocean life forms may be more sensitive to PH changes. Coral reefs and other organisms whose shells contain calcium carbonate(碳酸钙) may be particularly affected if the water's acidity levels keep going up, the team predict. They could find it much more difficult to build these structures in water with a lower PH.
In recent years some people have suggested storing carbon dioxide from power station in the deep ocean as a way of dealing with global warming. But Dr Caldeira said that such a strategy should now be re—considered. “Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing——because in releasing CO2 into the atmosphere we warm the planet, and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.”
67. The ocean is becoming more acidic due to___________.
A. the lower water PH value B. the warming atmosphere
C. the higher level of CO2 in the air D. the increasing use of oil fuels
68. According to Dr Caldeira, ___________.
A. ocean absorption of carbon dioxide is a good thing
B. more oil fuels will be used in the near future
C. scientists may predict climate changes with computer models
D. the future situation of the amount of acidity is extremely serious
69. If the water's acidity level keeps rising, ___________.
A. ocean life whose structures contain calcium carbonate may be affected
B. the water's PH value will become higher and higher
C. organisms living near the surface are more sensitive to PH changes
D. some disastrous events will occur more often than before
70. Most experts once believed storing carbon dioxide in the ocean would reduce___________.
A. the CO2 absorbed by the ocean B. the amount of greenhouse warming
C. the acidity of the ocean D. the gradual release of CO2
高三英语阅读理解简单题查看答案及解析
Scientists have long understood the key role that oceans play in regulating the Earth’s climate. Oceans cover 70 percent of the globe and store a thousand times more heat than the atmosphere does. What’s newer is the understanding of how this key component of our climate system responds to global warming.
A brake on global warming — for now
One of oceans’most important climate functions is absorbing heat and carbon dioxide (CO2), one of the gases that cause global warming. Acting as a heat sponge (海绵), oceans have absorbed huge amounts of heat and CO2 in the last forty years.
Fujita explains that "oceans are saving us from faster climate change — they are a big flywheel that delays rapid overheating of the Earth, putting a brake on the climate system."
"That’s the good news," he adds. "The bad news is that oceans only slow the atmospheric warming. Once oceans come to balance with a greenhouse gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter." But where and how oceans release this accumulated (积累的) heat is uncertain. And as oceans store heat, fragile underwater ecosystems are struggling.
The most recent scientific report from the Intergovernmental Panel on Climate Change (IPCC) also notes with concern that oceans are acidifying because of increased absorption of atmospheric CO2, and thus causing a threat for shell-forming species. Sharp increases in carbon dioxide levels will cause further acidification of oceans.
Currents distributing heat
Another important role oceans play is that of distributor. Oceans deliver heat and life-sustaining nutrients around the globe. Just as blood vessels bring oxygen and nutrients to cells in the human body, oceans’ currents carry oxygen, nutrients and heat throughout the Earth. Oceans distribute 25 percent to 50 percent of the energy the planet receives from the sun. For example, the Gulf Stream carries heat across the Atlantic. This warm current gives northwestern Europe a milder climate than it would normally have so far north. A change to oceans’ circulation (循环) patterns could throw Europe into a colder period, even as the rest of world experiences warmer temperatures.
1.We can infer from the passage that .
A.oceans cause global warming
B.oceans stop global warming
C.oceans release nutrients and heat
D.ocean ecosystems face more dangers
2.From the passage we can learn that oceans’ currents .
A.produce oxygen and nutrients everywhere
B.absorb 25% to 50% of the energy from the sun
C.distribute heat and nutrients around the globe
D.change oceans’ circulation patterns
3.Which of the following is NOT the result of oceans absorbing heat and carbon dioxide?
A.It causes further acidification.
B.It affects shell-forming species.
C.It makes the atmosphere hotter.
D.It regulates the Earth’s climate.
4.This passage mainly talks about .
A.the roles of oceans B.global warming
C.ocean currents D.carbon dioxide
高三英语阅读理解中等难度题查看答案及解析
Scientists have long understood the key role that oceans play in controlling the Earth’s climate. Oceans cover 70 per cent of the surface of the globe and store a thousand times more heat than the atmosphere does. What’s newer is the understanding of how this key component(组成部分) of our climate system responds to global warming.
A brake on global warming—for now
One of the oceans’ most important climate functions is absorbing heat and carbon dioxide(CO2), one of the gases that causes global warming. Acting as something absorbing heat, the oceans have absorbed huge amounts of heat and CO2 in the last forty years.
Fujita explains, “the oceans are saving us from faster climate change—they are putting a brake on the climate system.”
“That’s the good news,” he adds. “The bad news is that the oceans only slow the atmospheric warming. Once the oceans come to balance with a greenhouse-gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter.” But where and how the oceans release this slowly increased heat is uncertain. And as the ocean stores heat, fragile(脆弱的) underwater ecosystems are struggling.
The most recent scientific report from the Intergovernmental Panel on Climate Change(IPCC) also notes with concern that the ocean is acidifying(酸化) because of increased absorption of atmospheric CO2. and thus causing a threat to shell-forming species. Sharp increase in CO2 levels will cause further acidification of the ocean.
Currents distributing heat
Another important role the oceans play is that of distributor(散布者). Oceans deliver heat and life-sustaining nutrition around the globe. Just as blood tube bring oxygen and nutrition to cells in the human body, the ocean’s currents carry oxygen, nutrients and heat throughout the Earth. The ocean distributes 25 to 50 per cent of energy the planet receives from the sun. For example, the Gulf Stream carries heat across the Atlantic. This warm current gives northwestern European a milder climate that it would normally have so far north. A change to the ocean’s circulation patterns could throw Europe into a colder period, even as the rest of the world is experiencing warmer temperatures.
1. We can infer from the passage that _______.
A.the oceans cause global warming | B.the oceans stop global warming |
C.the oceans release nutrients and heat | D.the ocean ecosystems face more dangers |
2. From the passage we can learn that ocean’s currents _______.
produce oxygen and nutrients around absorb 25-50% of the energy from the sun distribute the atmosphere hotterD. change the ocean’s circulation patterns
3. Which of the following are the results of the ocean absorbing heat and CO2?
a. It causes further acidification.
b. It makes the atmosphere hotter.
c. It balances the oceans with a green-house gas.
d. It affects shell-forming species.
e. It makes the oceans act as a heat sponge.
f. It controls the Earth’s climate.
A.a-c-f | B.a-d-f | C.b-d-e | D.b-c-e |
4. If the ocean’s circulation pattern changed, ______.
A.Asia would suffer a hotter climate. |
B.Europe would become hotter |
C.the rest of the world would become warmer. |
D.the climate of Europe would become colder. |
高三英语阅读理解中等难度题查看答案及解析