听力题M: Hey, Jane! What''s so interesting?
W: What? Oh
听力题W: Oh, Jack, I''m glad I called you
听力题 In 1946 there was a program in the Rio Grande valley to substitute the hybrid com, which is produced by mixing several types of corn, for the native corn. The native corn was of poor nutritional quality and gave a poor quantity of grain, while the hybrid corn was of excellent quality and gave about three times as large a crop as the native variety. In the first year, half of the 84 farmers in the village planted the hybrid corn and doubled the corn production. Three years later, however, only three farmers planted the hybrid corn. The others were planting the traditional variety.
At the beginning of the project, the program leader studied the pattern of the natural relations of plants, animals, and people to each other and to their surroundings of the area and showed films demonstrating the superiority of the new corn. The farmers agreed that the hybrid corn had great advantages. The size of the corn confirmed these advantages. Why did they stop planting it? They complained that it wasn''t good for cooking and they didn''t like the flavor.
In 1946 there was a program in the Rio Grande valley to substitute the hybrid com, which is produced by mixing several types of corn, for the native corn. The native corn was of poor nutritional quality and gave a poor quantity of grain, while the hybrid corn was of excellent quality and gave about three times as large a crop as the native variety. In the first year, half of the 84 farmers in the village planted the hybrid corn and doubled the corn production. Three years later, however, only three farmers planted the hybrid corn. The others were planting the traditional variety.
At the beginning of the project, the program leader studied the pattern of the natural relations of plants, animals, and people to each other and to their surroundings of the area and showed films demonstrating the superiority of the new corn. The farmers agreed that the hybrid corn had great advantages. The size of the corn confirmed these advantages. Why did they stop planting it? They complained that it wasn''t good for cooking and they didn''t like the flavor.
听力题[此试题无题干]
听力题M: Mary, last week in our history class
听力题In the 1970s
听力题W: Hello. 15th District. Officer Mary speaking
听力题[此试题无题干]
听力题 Smoking is even more dangerous than previously believed, according to a major review of medical data by the World Health Organization''s cancer agency. The International Agency for Research on Cancer (IARC) also published the first evidence to link second hand smoke with increased risk of cancer.
The agency convened 29 scientists from 12 countries to review all significant published research on both active and passive smoking. They state explicitly that even an average degree of passive exposure to tobacco products can cause lung cancer in people who have never smoked. "It''s been suspected for a long time," said Professor Richard Doll, one of the report''s authors, "but this is the first time we''ve had a clear scientific consensus saying it''s definitely a cause." Fifty years ago, Professor Doll was a joint author of the first published paper to suggest a link between tobacco and lung cancer.
The agency''s report also implicates tobacco in five cancer sites not previously shown to be associated with smoking—the stomach, liver, uterine cervix, kidney (renal cell carcinoma), and myeloid leukaemia. "The additional risk to these sites from smoking varies from about 30% to double," said Professor Doll. " Some were previously suspected, but this is the first time there is solid evidence."
Cancers normally linked to hormonal causes seem to be unaffected by smoking. In particular, the agency''s working group rejected suggestions that passive smoking can cause breast cancer. The agency was unable to provide a definitive answer, however, to the question of whether passive smoke by children in the home is linked to childhood cancers.
Smoking is even more dangerous than previously believed, according to a major review of medical data by the World Health Organization''s cancer agency. The International Agency for Research on Cancer (IARC) also published the first evidence to link second hand smoke with increased risk of cancer.
The agency convened 29 scientists from 12 countries to review all significant published research on both active and passive smoking. They state explicitly that even an average degree of passive exposure to tobacco products can cause lung cancer in people who have never smoked. "It''s been suspected for a long time," said Professor Richard Doll, one of the report''s authors, "but this is the first time we''ve had a clear scientific consensus saying it''s definitely a cause." Fifty years ago, Professor Doll was a joint author of the first published paper to suggest a link between tobacco and lung cancer.
The agency''s report also implicates tobacco in five cancer sites not previously shown to be associated with smoking—the stomach, liver, uterine cervix, kidney (renal cell carcinoma), and myeloid leukaemia. "The additional risk to these sites from smoking varies from about 30% to double," said Professor Doll. " Some were previously suspected, but this is the first time there is solid evidence."
Cancers normally linked to hormonal causes seem to be unaffected by smoking. In particular, the agency''s working group rejected suggestions that passive smoking can cause breast cancer. The agency was unable to provide a definitive answer, however, to the question of whether passive smoke by children in the home is linked to childhood cancers.
听力题Questions 9 to 11 are based on the conversation you have just heard
听力题People enjoy taking trips
听力题 Smoking is even more dangerous than previously believed, according to a major review of medical data by the World Health Organization''s cancer agency. The International Agency for Research on Cancer (IARC) also published the first evidence to link second hand smoke with increased risk of cancer.
The agency convened 29 scientists from 12 countries to review all significant published research on both active and passive smoking. They state explicitly that even an average degree of passive exposure to tobacco products can cause lung cancer in people who have never smoked. "It''s been suspected for a long time," said Professor Richard Doll, one of the report''s authors, "but this is the first time we''ve had a clear scientific consensus saying it''s definitely a cause." Fifty years ago, Professor Doll was a joint author of the first published paper to suggest a link between tobacco and lung cancer.
The agency''s report also implicates tobacco in five cancer sites not previously shown to be associated with smoking—the stomach, liver, uterine cervix, kidney (renal cell carcinoma), and myeloid leukaemia. "The additional risk to these sites from smoking varies from about 30% to double," said Professor Doll. " Some were previously suspected, but this is the first time there is solid evidence."
Cancers normally linked to hormonal causes seem to be unaffected by smoking. In particular, the agency''s working group rejected suggestions that passive smoking can cause breast cancer. The agency was unable to provide a definitive answer, however, to the question of whether passive smoke by children in the home is linked to childhood cancers.
Smoking is even more dangerous than previously believed, according to a major review of medical data by the World Health Organization''s cancer agency. The International Agency for Research on Cancer (IARC) also published the first evidence to link second hand smoke with increased risk of cancer.
The agency convened 29 scientists from 12 countries to review all significant published research on both active and passive smoking. They state explicitly that even an average degree of passive exposure to tobacco products can cause lung cancer in people who have never smoked. "It''s been suspected for a long time," said Professor Richard Doll, one of the report''s authors, "but this is the first time we''ve had a clear scientific consensus saying it''s definitely a cause." Fifty years ago, Professor Doll was a joint author of the first published paper to suggest a link between tobacco and lung cancer.
The agency''s report also implicates tobacco in five cancer sites not previously shown to be associated with smoking—the stomach, liver, uterine cervix, kidney (renal cell carcinoma), and myeloid leukaemia. "The additional risk to these sites from smoking varies from about 30% to double," said Professor Doll. " Some were previously suspected, but this is the first time there is solid evidence."
Cancers normally linked to hormonal causes seem to be unaffected by smoking. In particular, the agency''s working group rejected suggestions that passive smoking can cause breast cancer. The agency was unable to provide a definitive answer, however, to the question of whether passive smoke by children in the home is linked to childhood cancers.
听力题 We can agree with primitive man that food is a basic need, but we differ from him in our food wants because of the wide variety of food we have available compared with him; we have a wider choice. Take fruit for example, not only can we enjoy the fruits grown in his century, but because of modern methods of transport and food preservation, we can also enjoy the more fruits from foreign countries thousands of miles away, whereas primitive man is limited in his choice to the kinds of fruit which actually grow where he lives.
However they differ in satisfying their hunger, primitive and civilized men both experience the basic need for food.
The same is true of the second of our human need. Clothing is necessary to regulate the heat of our bodies. Since we live in a temperate climate we need more clothes than people living in tropic conditions. Likewise, our clothing needs to change with seasons.
Shelter, the third of our needs, depends upon the climate, the skill of the builder, one''s social position, and the materials available. The simple shelter of primitive man would not do for us, and yet it satisfies his needs. The three-bedroom suburban house of the average family would not be grand enough for a rich family, and yet the modern house contains many of the material comforts which were denied to the Kings and Queens of old.
We can agree with primitive man that food is a basic need, but we differ from him in our food wants because of the wide variety of food we have available compared with him; we have a wider choice. Take fruit for example, not only can we enjoy the fruits grown in his century, but because of modern methods of transport and food preservation, we can also enjoy the more fruits from foreign countries thousands of miles away, whereas primitive man is limited in his choice to the kinds of fruit which actually grow where he lives.
However they differ in satisfying their hunger, primitive and civilized men both experience the basic need for food.
The same is true of the second of our human need. Clothing is necessary to regulate the heat of our bodies. Since we live in a temperate climate we need more clothes than people living in tropic conditions. Likewise, our clothing needs to change with seasons.
Shelter, the third of our needs, depends upon the climate, the skill of the builder, one''s social position, and the materials available. The simple shelter of primitive man would not do for us, and yet it satisfies his needs. The three-bedroom suburban house of the average family would not be grand enough for a rich family, and yet the modern house contains many of the material comforts which were denied to the Kings and Queens of old.
听力题If the earth gets hotter in the new century
听力题M: Hi, Susan. Where were you at lunchtime
听力题 The living conditions for the poor and for immigrants in New York City during the late nineteenth century were truly wretched. Over one and a half million poor people lived in tenements, a form of barracks-like building that could house some five hundred people in a structure lacking heat and plumbing. The resulting poverty, disease, and crime make tenement life degrading and often fatal.
But almost as shocking as the city-condoned horror of the tenements was the government''s neglect of normal city functions. Real estate development was uncontrolled, resulting in factories, stores, and residences springing up randomly without consideration of zoning or building codes. Pollution of waterways was unrestricted, streets were poorly paved, lighting was inadequate, and sewage disposal was insufficient. Some of the poor housing can be blamed on New York''s rapid population growth. But most of the wretched living conditions in the city must be attributed to the corrupt city government of the late nineteenth century.
The living conditions for the poor and for immigrants in New York City during the late nineteenth century were truly wretched. Over one and a half million poor people lived in tenements, a form of barracks-like building that could house some five hundred people in a structure lacking heat and plumbing. The resulting poverty, disease, and crime make tenement life degrading and often fatal.
But almost as shocking as the city-condoned horror of the tenements was the government''s neglect of normal city functions. Real estate development was uncontrolled, resulting in factories, stores, and residences springing up randomly without consideration of zoning or building codes. Pollution of waterways was unrestricted, streets were poorly paved, lighting was inadequate, and sewage disposal was insufficient. Some of the poor housing can be blamed on New York''s rapid population growth. But most of the wretched living conditions in the city must be attributed to the corrupt city government of the late nineteenth century.
听力题M: Hello, darling. Did you have a good day
听力题M: Dr. Thomas
听力题W: Where are you going to spend your holiday this year? George?
M: We may go abroad, but I''m not so sure.
W: What do you mean?
M: Well, my wife''s talking about China recently. She may want to go there. I''d like to go there, too.
W: Yes, it''s an interesting country to see.
M: But we can''t make up our minds yet. You know, a round-trip ticket to China costs me a lot.
W: But you could go by sea.
M: You are right. It''s cheap, isn''t it?
W: You can save at least half of the money if you go by ship.
M: But don''t you think it would take a long time and.. .
W: But you can enjoy viewing the sea and the rising sun.
M: Yes. I''ll talk to my wife.
W: You''ll definitely enjoy yourselves. I''m sure.
M: Don''t be so sure. We may not go anywhere.
W: You always hesitate at everything.
M: It''s not my fault, you know. My wife always worries too much.
W: Like what?
M: Well, who''s going to look after the house? Who''s going to look after the garden? And who''s going to look after the pets? We have these problems every year. And in the end, we stay at home and look after everything.
W: Where are you going to spend your holiday this year? George?
M: We may go abroad, but I''m not so sure.
W: What do you mean?
M: Well, my wife''s talking about China recently. She may want to go there. I''d like to go there, too.
W: Yes, it''s an interesting country to see.
M: But we can''t make up our minds yet. You know, a round-trip ticket to China costs me a lot.
W: But you could go by sea.
M: You are right. It''s cheap, isn''t it?
W: You can save at least half of the money if you go by ship.
M: But don''t you think it would take a long time and.. .
W: But you can enjoy viewing the sea and the rising sun.
M: Yes. I''ll talk to my wife.
W: You''ll definitely enjoy yourselves. I''m sure.
M: Don''t be so sure. We may not go anywhere.
W: You always hesitate at everything.
M: It''s not my fault, you know. My wife always worries too much.
W: Like what?
M: Well, who''s going to look after the house? Who''s going to look after the garden? And who''s going to look after the pets? We have these problems every year. And in the end, we stay at home and look after everything.
听力题[此试题无题干]