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1、Unit 4Task 1【答案】A.1) They are farms that grow vegetables for city people to eat fresh.2) Its a farm that grow plants and flowers to sell.3) They protect the plants from the cold in the winter but let them get plenty of light, so the plants can be grown all through the year.B.1) canned, frozen2) flow
2、ers, garden plants, home gardens, yards, window boxes3) buildings, furniture, firewood【原文】Grain, vegetables and fruits are found on most farms. All of them are food for animals and people.Grain can be fed to animals just as it is harvested. But before people use them grains are usually made into flo
3、ur or breakfast cereal. Bread, macaroni（通心粉）, and cereals（麦片） all come from grain.Tomatoes, beans, potatoes, beets（甜菜）, lettuce（生菜）, carrots and onions are field and garden vegetables. Can you think of any others? Vegetables are good for people and for some animals such as pigs and rabbits.Farms tha
4、t grow vegetables for city people to eat fresh are called truck farms. Truck farms are usually close to big cities. Each day hundreds of loads of fresh vegetables are brought to stores on the farmers trucks. Without the truck farmers people in cities would not eat well. And without city people who e
5、at fresh vegetables, the truck farmers would have no work.There are many kinds of fruit. Apples, pears, peaches, cherries, oranges, grapefruit, and berries are a few kinds. You will be able to think of other kinds that you like. Most fruit is grown on specialized farms. But many general farms have s
6、ome fruit to use and sell also.Like vegetables, fruit is sold fresh in markets. But a large part of both fruit and vegetable crops is sent to factories to be canned or frozen.In warm parts of our country farmers grow cotton, rice, tobacco, sugar cane（甘蔗）, and peanuts.Specialized farms raise flowers
7、and garden plants. They are sold to florists（花商） and to families for home gardens, or yards, or window boxes. A farm that grow plants and flowers to sell is called a nursery（苗圃）. Most nurseries have glass buildings, called hothouses or greenhouses. The hothouses are heated to protect the plants from
8、 cold in the winter but let them get plenty of light, so they can be grown all through the year.Some farms grow only trees. Some of these are Christmas tree farms. Others are large forests where trees are grown for their wood. The wood is used for buildings, furniture and firewood. Some tree farms g
9、row only nut trees.Task 2【答案】A.Problems ConcernedThe safety of some pesticides used to kill insects, especially in developing countries:1. poor quality pesticides, which often contain harmful chemicals2. the poor quality of pesticide containers and product information on the containersAdvantages of
10、Pesticides1. pesticides kill insects and other organisms that threaten crops.2. pesticides also are used for public health. They control insects that spread disease, such as mosquitoes that spread malaria.Possible Causes of Low Quality PesticidesProduction problems and failure to use the right chemi
11、cals.B.1) The UN agencies report that the market value of pesticides in developing countries last year was about three thousand million dollars.2) The agencies called for worldwide acceptance of Food and Agriculture and World Health Organization pesticide rules. They say this would help guarantee th
12、e safe production of and trade in pesticides.【原文】Two United Nations agencies are expressing concern about the safety of some pesticides used to kill insects. They report that about thirty percent of all pesticides sold in developing countries fail to meet widely accepted rules for quality. They say
13、these products are a serious threat to human health and the environment.The UN Food and Agriculture Organization and the World Health Organization gave the warning.In developing countries, pesticides are used mainly for agriculture. Pesticides kill insects and other organisms that threaten crops. Pe
14、sticides also are used for public health. They control insects that spread disease, such as mosquitoes that spread malaria.The UN agencies report that the market value of pesticides in developing countries last year was about three thousand million dollars. They say the estimated market value of pes
15、ticides worldwide was thirty-two thousand million dollars.Officials say poor quality pesticides often contain harmful chemicals. These chemicals often are banned or restricted in some countries.Possible causes of low quality in pesticides include production problems and failure to use the right chem
16、icals. Officials say the active chemicals in many pesticides are stronger than those permitted by many governments. They also say poor quality pesticides may contain poisonous substances or substances that are not pure.Officials say the quality of pesticide containers and product information on the containers are other concerns. They say information on the containers often fails to explain the active chem
