A few years ago it was popular to speak of a generation gap, a disagreement between young people and their elders. Parents said that children did not show them proper respect and obedience, while children complained that their parents did not understand them at all. What had gone wrong Why had the generation gap suddenly appeared Actually the generation gap has been around for a long time. Many people argue that a gap is built into the fabric of our society.
One important cause of the generation gap is the chance that young people have to choose their own ways of life. In more traditional societies, when children grow up, they are expected to live in the same area as their parents, to marry people that their parents know and agree to, and to continue the family occupation. In our society, young people often travel great distances for their education, move out of the family home at an early age, marry or live with people whom their parents have never met, and choose occupations different from those of their parents.
In our easily changing society, parents often expect their children to do better than they did: to find better jobs, to make more money, and to do all the things that they were unable to do. Often, however, the strong desire that parents have for their children are another cause of the disagreement between them. Often, they discover that they have very little in common with each other.
Finally, the speed at which changes take place in our society is another cause of the gap between the generations, In a traditional culture, elderly people revalued for their wisdom, but in our society the knowledge of a lifetime may become out of date overnight. The young and the old seem to live in two very different worlds, separated by different skills and abilities.
No doubt, the generation gap will continue to be a feature of American life for some time to come. Its causes are rooted in the freedom and changes in our society, and in the rapid speed at which society changes.
The main idea of the first paragraph is that ______.

A:the generation gap suddenly appeared B:the generation gap is a feature of modem social life C:people can reduce the generation gap D:many critics argue over the nature of the generation gap

Bond had walked for only a few minutes when it suddenly occurred to him that he was being followed. There was no evidence for it except a slight tingling (隐隐作痛) of the scalp (头皮) and an extra awareness of the people near him, but he had faith in his sixth sense and he at once stopped in from of the shop window he was passing and looked casually back along 46th Street. Nothing but a lot of miscellaneous people moving slowly on the sidewalks, mostly on the same side as himself, the side that was sheltered from the sun. There was no sudden movement into a doorway, nobody casually wiping his face with a handkerchief to avoid recognition, nobody bending down to tie a shoelace.
Bond examined the Swiss watches in his shop window and then turned and sauntered on. After a few yards he stopped again. Still nothing. He went on and turned right into the Avenue of the Americans, stopping in the first doorway, the entrance to a women’s underwear store where a man in a tan suit with his back to him was examining the black lace pants on a particularly realistic dummy (模型). Bond turned and leant against a pillar and gazed lazily but watchfully out into the street.

When Bond stopped and looked back along 46th street, he observed all the following except （　）

A:most people on the sidewalk were on the same side as himself B:no one suddenly turned into a doorway C:a man was looking into the windows of a store D:no one wiped his face with a handkerchief

What comes to mind when you think of a lake You probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty-seven people. Two years later, Lake Nyos erupted. A cloud of gases rolled down the hills and into the valleys and killed 1,700 people.
Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water "turns over" regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly.
However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases trapped at the bottom than other crater lakes. In fact, scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather, a storm, or a landslide (划破) causes the water to turn over suddenly, the gases escape in a violent explosion.
In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a 672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.
To protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn the people in the villages. That way, they will have time to escape from the dangerous gases.
What will happen when Lake Nyos and Lake Monoun explode

A:Water will flow down the hills. B:Poisonous gases will be released suddenly. C:A strong wind will rise from the lakes. D:The volcanoes will come to life.

What comes to mind when you think of a lake You probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty-seven people. Two years later, Lake Nyos erupted a cloud of gases rolled down the hills and into the valleys and killed 1,700 people.
Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water "turns over" regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly.
However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases tapped at the bottom than other crater lakes. In fact, scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather a storm, or a landslide causes the water to turn over suddenly, the gases escape in a violent explosion.
In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a 672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.
To protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn the people in the villages. That way, they will have time to escape from the dangerous gases.
What will happen when Lake Nyos and Lake Monoun explode

A:Water will flow down the hills. B:Poisonous gases will be released suddenly. C:A strong wind will rise from the lakes. D:The volcanoes will come to lif

{{B}}第三篇{{/B}}

What will happen when Lake Nyos and Lake Monoun explode?

A:Water will flow down the hills. B:Poisonous gases will be released suddenly. C:A strong wind will rise from the lakes. D:The volcanoes will come to life.

第三篇 The Exploding Lakes of Cameroon What comes to mind when you think of a lake? You probably imagine a pretty scene with blue water，birds，and fish．For the people in the northwestern Cameroon，however, the image is very different. For them，lakes may mean terrible disasters. In 1984，poisonous gases exploded out of Lake Monoun and came down into the nearby villages，killing thirty—seven people．Two years later,Lake Nyos erupted A cloud of gases rolled down the hills and into the valleys and killed 1,700 people． Lake Nyos and Lake Monoun are crater(火山口)lakes They were formed when water collected in the craters of old volcanoes The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes，these gases are released often because the water‘turns over’regularly．That is，the water from the bottom of the lake rises and mixes with the water at the top，allowing the gases to escape slowly． However，in Lakes Nyos and Monoun，there is no regular turning over．No one knows the reason for this fact，but as a result，these lakes have more gases tapped at the bottom than other crater lakes. In fact，scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases．When a strong wind，cool weather a storm，or a landslide(滑坡)causes the water to turn over suddenly，the gases escape in a violent explosion． In the past，no one knew when the gases might explode，so there was no way for the villagers to escape disaster. Now scientists from the United States，France，and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos．They stood a 672-foot plastic pipe in the middle of the lake，with one end of the pipe near the bottom and the other end in the air．Near the top of the pipe，the team put several holes that could be opened or closed by a computer．Now，when the gas pressure gets too high，the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain．With less pressure，a disastrous explosion is much less likely．However, the scientists are not sure that one pipe will be enough to prevent explosions．They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well． To protect people nearby until all of the pipes are in place．the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level，computers will set off loud sirens(警报)and bright lights to warn the people in the villages．That way, they will have time to escape from the dangerous gases． What will happen when Lake Nyos and Lake Monoun explode?

A:Water will flow down the hills B:Poisonous gases will be released suddenly． C:A strong wind will rise from the lakes D:The volcanoes will come to life．

For an increasing number of students at American universities, old is suddenly in. The reason is obvious: the graying of America means jobs. Coupled with the aging of the baby-boom (生育高峰) generation, a longer life span means that the nation’s elderly population is bound to expand significantly over the next 50 years. By 2050, 25 percent of all Americans will be older than 65, up from 14 percent in 1995. The change poses profound questions for government and society, of course. But it also creates career opportunities in medicine and health professions, and in law and business as well. "In addition to the doctors, we’re going to need more sociologists, biologists, urban planners and specialized lawyers," says Professor Edward Schneider of the University of Southern California’s (USC School of Gerontology, 老年学).
Lawyers can specialize in "elder law," which covers everything from trusts and estates to nursing-home abuse and age discrimination. Businessmen see huge opportunities in the elder market because the baby boomers, 74 million strong, are likely to be the wealthiest group of retirees in human history. "Any student who combines an expert knowledge in gerontology with an MBA or law degree will have a license to print money," one professor says.
Margarite Santos is a 21-year-old senior at USC. She began college as a biology major but found she was "really bored with bacteria." So she took a class in gerontology and discovered that she liked it. She says, "I did volunteer work in retirement homes and it was very satisfying./
..old is suddenly in (Line 1, Par

A:A．1) most probably means "______". America has suddenly become a nation of old people gerontology has suddenly become popular more elderly professors are found on American campuses American colleges have realized the need of enrolling older students

Passage 3 A few years ago it was popular to speak of a generation gap, a disagreenment between young people and their elders. Parents said that children did not show them proper respect and obedience, while children complained that their parents did not understand them at all. What had gone wrong Why had the generation gap suddenly appeared Actually the generation gap has been around for a long time. Many people argue that a gap is built into the fabric of our society. One important cause of the generation gap is the chance that young people have to choose their own ways of life. In more traditional societies, when children grow up, they are expected to live in the same area as their parents, to marry people that their parents know and agree to, and to continue the family occupation. Nowadays, young people often travel great distances for their education, move out of the family home at an early age, marry or live with people whom their parents have never met, and choose occupations different from those of their parents. In our easily changing society, parents often expect their children to do better than they did: to find better jobs, to make more money, and to do all the things that they were unable to do. Often, however, the strong desire that parents have for their children are another cause of the disagreement between them. Often, they discover that they have very little in common with each other. Finally, the speed at which changes take place in our society is another cause of the gap between the generations, In a traditional culture, elderly people revalued for their wisdom, but in our society the knowledge of a lifetime may become out of date overnight. The young and the old seem to live in two very different worlds, separated by different skills and abilities. No doubt, the generation gap will continue to be a feature of American life for some time to come. Its causes are rooted in the freedom and changes in our society, and in the rapid speed at which society changes. The main idea of the first paragraph is that .

A:the generation gap suddenly appeared B:the generation gap is a feature of modern social life C:people can reduce the generation gap D:many critics argue over the nature of the generation gap

Passage 3 A few years ago it was popular to speak of a generation gap, a disagreenment between young people and their elders. Parents said that children did not show them proper respect and obedience, while children complained that their parents did not understand them at all. What had gone wrong Why had the generation gap suddenly appeared Actually the generation gap has been around for a long time. Many people argue that a gap is built into the fabric of our society. One important cause of the generation gap is the chance that young people have to choose their own ways of life. In more traditional societies, when children grow up, they are expected to live in the same area as their parents, to marry people that their parents know and agree to, and to continue the family occupation. Nowadays, young people often travel great distances for their education, move out of the family home at an early age, marry or live with people whom their parents have never met, and choose occupations different from those of their parents. In our easily changing society, parents often expect their children to do better than they did: to find better jobs, to make more money, and to do all the things that they were unable to do. Often, however, the strong desire that parents have for their children are another cause of the disagreement between them. Often, they discover that they have very little in common with each other. Finally, the speed at which changes take place in our society is another cause of the gap between the generations, In a traditional culture, elderly people revalued for their wisdom, but in our society the knowledge of a lifetime may become out of date overnight. The young and the old seem to live in two very different worlds, separated by different skills and abilities. No doubt, the generation gap will continue to be a feature of American life for some time to come. Its causes are rooted in the freedom and changes in our society, and in the rapid speed at which society changes. The main idea of the first paragraph is that .

A:the generation gap suddenly appeared B:the generation gap is a feature of modern social life C:people can reduce the generation gap D:many critics argue over the nature of the generation gap