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Compose an essay (60 points). Some people often say, "Opportunity plays a vital role in success". Do you go along with the idea. Write an essay (about 300 words) expressing your view on it.

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The following passage is incomplete with one body paragraph missing. Study the passage carefully and write the missing paragraph in about 100 words. Make sure that your tone and diction are in unity with the passage provided. Increasingly, over the past ten years, people—especially young people—have become a ware of the need to change their eating habit, because much of the food they eat, particularly processed food, is not good for the health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming today. Natural food, for example, are vegetable, fruit and grain which have been grown in soil that is rich in organic 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 foods grown in commercial farming areas. Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry, 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. It is significant 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 rare. Hence, the emphasis is placed on the eating of wholemeal bread and more vegetables by modern experts on "healthy eating".

关系数据库设计理论主要有3个方面,其中最主要的是(22)。

A. 范式
B. 数据模式
C. 数据依赖
D. 范式和数据依赖

系统软件是(50)的软件。

A. 向应用软件提供系统调用等服务
B. 并不具体提供入机界面
C. 在应用软件基础上开发
D. 与具体硬件逻辑功能无关

(58)属于第三层VPN协议。

A. TCP
B. SSL
C. PPOE
D. IPSec

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