Increasingly ,over the past ten years ,people—especially young people—have become aware of the need to change their eating habits ,because much of the food they eat ,particularly processed foods ,is not good for the health .As a result ,there has been a growing interest in natural foods :foods which do not contain chemical fertilizers ,widely used in farming today .

    Natural foods ,for example ,are vegetables ,fruit and grain which have been grown in soil that is rich in organic(有机的)matter . In simple terms ,this means that the soil has been nourished by unused vegetable matter ,which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers , the main purpose of which is to increase the amount—but not the quality—of food grown in commercial farming areas .

    Natural foods also include animals which have been allowed to feed and move freely in healthy grassland for cattle .Compare this with what happens in the mass production of poultry (家禽):there are battery farms ,for example ,where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish .Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins .

    There are other things of healthy eating which are now receiving increasing attention from experts on diet .Take ,for example ,the question of sugar .This is actually a non-essential food! Although another natural food ,such as honey ,can be used to sweeten food if this is necessary ,we can in fact do without it .It is not that sugar is harmful in itself .But it does seem to be addictive : the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year !Yet all it does is provide us with energy ,in the form of calories .There are no vitamins in it ,no minerals ,and no fibre .

    It’s very important that nowadays fibre is considered to be an important part of a healthy diet .In white bread ,for example ,the fibre has been removed .But it is present in unrefined flour and of course in vegetables .It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables ,certain diseases are comparatively not often seen .For this reason ,the importance is placed on the eating of wholemeal(没有去麸的面粉)bread and more vegetables by modern experts on “healthy eating”.

People have become more interested in natural foods because            .

    A．they want to keep fit

    B．they want to taste all kinds of foods

    C．natural foods are more delicious than processed foods

    D．they want to return to nature

Chickens raised in poultry farms are all of the following EXCEPT that            .

    A．they are fed on food which is little better than garbage

    B．they live in very crowed condition 

    C．the eggs they produce lack vitamins 

    D．they are allowed to move about and eat freely 

According to the passage,_________.

    A．people need sugar to give them energy

    B．sugar is bad for the health

    C．the use of sugar is habit forming

    D．sugar only sweetens food, but provides us with nothing useful

Increasingly, over the past ten years, people--- especially young people –have become aware of the need to change their eating habits, because much of the food they eat, especially processed food(加工过的食品), is not good for the health. As a result, there has been a growing interest in natural foods: foods which do not contain chemical additives(添加剂) and which have not been affected by chemical fertilizers(化肥), widely used in farming today.

Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple words, this means that the soil has been nourished(给…营养) by unused vegetable matter, which provides it with vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount—but not the quality—of foods grown in commercial farming area.

Natural foods also include animals which have been allowed to feed move freely in healthy pastures(牧场). Compare this with what happens in the mass production of poultry(家禽)：there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.

There are other sides of healthy eating which are now receiving increasing attention from experts on diet. Take, for example, the question of sugar. This is actually unnecessary food. It is not that sugar is harmful in itself. But it does seem to be addictive: the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is provide us with energy, in the form of calories. There are no vitamins in it, no minerals, and no fibre.

1.People have become more interested in natural foods because______.

A. they want to keep healthy                               

B. they want to taste all kinds of foods

C. natural foods are more delicious than processed foods       

D. they want to return to nature

2.Chickens raised in poultry farms are all of the following EXCEPT that _____.

A. they are fed on food which is little better than garbage    

B. they live in very crowded condition

C. the eggs they produce lack vitamins             

D. they are allowed to move about and eat freely

3.According to the passage, ______.

A. people can only find sugar to give them energy      

B. sugar is bad for the health

C. the use of sugar is habit forming

D. sugar only sweetens food, but provides us with nothing useful

Increasingly ,over the past ten years ,people—especially young people—have become aware of the need to change their eating habits ,because much of the food they eat ,particularly processed foods ,is not good for the health .As a result ,there has been a growing interest in natural foods :foods which do not contain chemical fertilizers ,widely used in farming today .

Natural foods ,for example ,are vegetables ,fruit and grain which have been grown in soil that is rich in organic(有机的)matter . In simple terms ,this means that the soil has been nourished by unused vegetable matter ,which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers , the main purpose of which is to increase the amount—but not the quality—of food grown in commercial farming areas .

Natural foods also include animals which have been allowed to feed and move freely in healthy grassland for cattle .Compare this with what happens in the mass production of poultry (家禽):there are battery farms ,for example ,where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish .Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins .

There are other things of healthy eating which are now receiving increasing attention from experts on diet .Take ,for example ,the question of sugar .This is actually a non-essential food! Although another natural food ,such as honey ,can be used to sweeten food if this is necessary ,we can in fact do without it .It is not that sugar is harmful in itself .But it does seem to be addictive : the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year !Yet all it does is provide us with energy ,in the form of calories .There are no vitamins in it ,no minerals ,and no fibre .

It’s very important that nowadays fibre is considered to be an important part of a healthy diet .In white bread ,for example ,the fibre has been removed .But it is present in unrefined flour and of course in vegetables .It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables ,certain diseases are comparatively not often seen .For this reason ,the importance is placed on the eating of wholemeal(没有去麸的面粉)bread and more vegetables by modern experts on “healthy eating”.

1.People have become more interested in natural foods because            .

2.Chickens raised in poultry farms are all of the following EXCEPT that           .

3.According to the passage,_________.

London has always been known for its "black fogs. “ In the winter of 1952，a milky white fog rolled into the city. As the smoke poured into the air, it was so hard to see that people had to walk in front of the buses to guide them. In this way, the most serious air pollution disaster in history began. When it was over, more than 4,000 people had been killed by the thick black smog.

New York City has had several London-type smogs since 1950. Each time, there were from 100 to 400 deaths caused by the smog. Although these smogs were not as deadly as London’ s,

New York City has the worst air pollution problem in the United States.

In all the killer smogs, factories and homes poured smoke and fumes into the air from the furnaces. The chemical fumes combined with the water droplets in the fog to form harmful substances. These substances caused the illness of those who breathed the polluted air.

Usually, such harmful fumes rise into the upper air and are blown away by the wind. But sometimes there is an unusual weather condition called a temperature inversion. A layer of cold air remains near the ground as smoke and fumes pour into it. This is covered by an upper layer of warm air that acts like a lid. It prevents the polluted cooler air from rising. The harmful fumes pile up and make people ill. The smog may be so thick that airports are closed and chains of collisions occur on the highways.

Another type of smog occurs in Los Angeles. Here the weather may be clear and sunny. But stinging eyes and dry coughs show that harmful chemicals fill the air. The smog is due to invisible gases, mostly from automobile exhaust. Because these chemicals are changed by the sun high up in the air, it is called photochemical smog. It contains automobile exhaust fumes and nitrogen oxides changed by the sun's rays. Added to these are sulfur dioxide and other ^{fumes from} factories and oil refineries. Photochemical smog is found in many large cities all over the world.

Killer smogs don，t happen very often, fortunately. But in Beijing, a combination of automobile exhaust fumes, home furnace smoke, and factory waste gases pours into the air. This may also happen in the suburbs, or out in the country, where large factories have been built. A number of harmful substances have been found in the air there. When these substances are breathed in day after day ，the health of the population is affected.

51.    Why do people call this phenomenon " black fog" ？

A. It is black and dirty.                        B. It can affect the health.

C. It can kill people.                            D. It is too thick for people to see something.

52.    What can reduce the air pollution according to the passage?

A. Water.                    B. Wind.                  C. The sun.                  D. Cold air.

53.When photochemical smog happens in the city, _____.

A. many people will be killed                B. black smoke may pour into the air

C. the weather may be fine                   D. people have to walk to work

54.From the passage we know that the most serious black smog disaster took place in_____

A, London               B. New York             C. Los Angeles              D. Beijing

Increasingly, over the past ten years, people--- especially young people –have become aware of the need to change their eating habits, because much of the food they eat, especially processed food(加工过的食品), is not good for the health. As a result, there has been a growing interest in natural foods: foods which do not contain chemical additives(添加剂) and which have not been affected by chemical fertilizers(化肥), widely used in farming today.
Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple words, this means that the soil has been nourished(给…营养) by unused vegetable matter, which provides it with vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount—but not the quality—of foods grown in commercial farming area.
Natural foods also include animals which have been allowed to feed move freely in healthy pastures(牧场). Compare this with what happens in the mass production of poultry(家禽)：there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.
There are other sides of healthy eating which are now receiving increasing attention from experts on diet. Take, for example, the question of sugar. This is actually unnecessary food. It is not that sugar is harmful in itself. But it does seem to be addictive: the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is provide us with energy, in the form of calories. There are no vitamins in it, no minerals, and no fibre.
1. People have become more interested in natural foods because______.
A. they want to keep healthy
B. they want to taste all kinds of foods
C. natural foods are more delicious than processed foods
D. they want to return to nature
2. Chickens raised in poultry farms are all of the following EXCEPT that _____.
A. they are fed on food which is little better than garbage
B. they live in very crowded condition
C. the eggs they produce lack vitamins
D. they are allowed to move about and eat freely
3. According to the passage, ______.
A. people can only find sugar to give them energy
B. sugar is bad for the health
C. the use of sugar is habit forming
D. sugar only sweetens food, but provides us with nothing useful