2. The fruit color of squash is controlled by two ...

The union stresses that____.

A．workers should also enjoy the fruits brought about by automation

B．no workers should be fired in the development of automation

C．it is necessary to slow down the development of automation

D．workers should be paid according to their length of service

听力原文： The term "balanced diet" is constantly heard but rarely explained. What it means is a diet that includes a combination of several different food types, including grains, fresh fruit and vegetables, meat, dairy products, fats and oils.

Crucial to the idea of a balanced diet is including foods in the right proportions; the aim is to get all the nutrients your body needs while maintaining a healthy weight. The US government provides a basic idea of what nutrients we need on their website.

It isn't a case of having roughly equal measures of everything. There should be a lot of some kinds and just a little of others. Some fats and oils, for example, are important in the diet for various reasons. But you only need a small amount compared with foods such as vegetables.

In the UK, the Food Standards Agency has developed a programme called The Balance of Good Health to show people what proportions and types of foods make up a healthy balanced diet. This divides foods into five different groups. The largest groups are bread and vegetables, followed by milk and meat. The smallest by far is the salt and sugar group.

Fresh fruit and vegetables are low in fat, calories and salt, and an excellent source of vitamins, minerals and fibre. Most of us don't eat enough to meet the current recommendation of three to five servings of vegetables and two to four servings of fruit a day. Protein-rich foods and dairy foods are needed in more moderate amounts. Your diet should include two to three servings of milk or dairy products a day, for example.

(33)

A．A diet largely consisting of fruits and vegetables.

B．A diet including grains, fresh fruit and vegetables, and meat.

C．A diet including a combination of several different food types.

D．A diet without fat and oils.

将下列句子翻译成中文 1.Free and esterified, saturated primary alcohols occur widely in natural, e.g., in fruit. Since their odor is relatively weak, their use as components in fragrance compositions is limited. Their use in aroma compositions, especially for fruit flavors, is by far more important (e.g., straight-chain C4-C10 alcohols, isoamyl alcohol). Unsaturated alcohols are most important (e.g., leaf alcohol with its intensely green odor) and may impart characteristic notes to compositions. Naturally occurring fatty alcohols used in the fragrance industry are produced principally by reduction of the methyl esters of corresponding carboxylic acids, which are obtained by transesterification of natural fats and oils with methanol. 2. 2-methylundecanal is produced by two routes: 2-undecanone is converted into its glycidate by reaction with alkyl chloroacetate. Saponification of the glycidate, followed by decarboxylation, yields 2-methylundecanal. The second synthesis is based on the conversion of undecanal into 2-methylene-undecanal by reaction with formaldehyde in the presence of catalytic amounts of amines. Hydrogenation of 2-methyleneundecanal yields methylnonylacetaldehyde. A convenient process starts from 1-decene: hydroformylation gives a mixture consisting mainly of undecanal and 2-methyldecanal. Reaction of the crude product with formaldehyde in the presence of dibutylamine yields a mixture containing over 50% 2-methyleneundecanal. After hydrogenation of double bond, pure 2-methylundecanal is separated from byproducts by fractional distillation.

The leading producer of organic fruits and vegetables in 1997 was ______.

The Advantages and Disadvantages of Buying Lottery

Tomato Ripening

Tomatoes give off minute quantities of ethylene gas which is active in starting the natural ripening process. If left to nature, however, the tomatoes ripen in a random way. The trickled ethylene gas process of tomato ripening consists of exposing the tomatoes to a low concentration of ethylene gas under controlled temperature conditions in a special tomato-ripening room. This treatment initiates and controls the speed of the natural ripening and colouring process in the tomatoes.

Controlled ripening and colouring enables the grower to market tomatoes of more uniform. colour and quality than is possible with green or fieldripened produce. Timing of harvesting and marketing may, within limits, also be regulated by the use of controlled ripening and colouring in order to achieve maximum returns and make the best use of labour and equipment.

Ripening Conditions

All fruit must be mature green at harvest for controlled ripening to be successfully carried out. Relative humidity does not appear to be of great importance in the tomato-ripening process. Little moisture loss from the tomatoes occurs during the ripening process due to the relatively impermeable nature of the tomato skin. Ripening time will depend on the ripening temperature range, however, ripening temperature above 24℃will result in poor colour development with yellow or orange fruit rather than red. The heating and cooling capacity should be such that the tomatoes can be brought to the recommended ripening temperature within 24 hours.

Room Size and Construction

For efficiency and convenience in operation, on-farm, tomato ripening rooms are usually sized to accommodate the normal daily tomato pick during the peak harvest time. The room capacity is generally in the range of two to ten tonnes of tomatoes. However, larger rooms may sometimes he installed. Since the average ripening time is three or four days, tile provision of multiple rooms on the farm is generally desirable.

Air Circulation and Ventilation System

Fan-forced air circulation is required tbr adequate and uniform. temperature control and ethylene gas distribution in the ripening room. An air circulation rate of two room air volumes per minute is recommended for good results. This is equivalent to around 480 cubic metres of air per hour per tonnes of tomatoes. At the recommended heating or cooling capacity of 0. 6 to 1.2kw per tonne of tomatoes, this gives an air circulation rates are necessary to limit variations in temperature in different parts of the room to acceptable levels and to achieve an adequate rate of heating or cooling of the tomatoes.

The ventilation system circulates the room air continuously, introducing a small proportion of fresh air and exhausting a similar amount of air at the same time. This prevents a build up of ethylene gas in the room and also removes carbon dioxide produced by the fruit during respiration. If this car- bon dioxide were allowed to build up to too high a level in the room atmosphere, it would interfere with the ripening process.

Temperature Control System

The temperature of tomatoes in the ripening room has a great influence on the ripening process. In fact, the product heat load usually represents around 80% of the total heat load. The remainder is due to heat transmission through the exterual walls of the room anti the fresh air exchange rate. In some cases, both heating anti cooling are required to maintain the room temperature within the required range. The time required for ripening can be reduced to some extent by increasing the temperature. Reverse cycle air-conditioners are successfully used for both heating and cooling in tomato-ripening rooms where humidity control does not

A．Y

B．N

C．NG

Patrons at a certain restaurant can select two of three appetizers—fruit, soup, and salad—along with two of three vegetables—carrots, squash, and peas.What is the probability that any patron will select fruit, salad, squash, and peas?

A.1/2

B.1/3

C.1/6

D.1/9

E.1/12

How does the KMB want to improve the shipping of kiwi fruit?

A．by increasing the number of ships it uses

B．by improving the way the fruit is packed

C．by lowering the temperature on the ships