雅思写作中对比论证的使用

The reason for this trend may involve the recognition that a young adult who passes directly from school to university is rather restricted in terms of general knowledge and experience of the world. By contrast, those who have spent some time earning a living or travelling to some places, have a broader view of life and better personal resources to draw on. They tend to be more independent, which is an important factor in academic study and research, as well as giving them an advantage in terms of coping with the challenges of student life. (C5T2)

Family structures are changing in the west. Once, the traditional structure of two parents with two children was the most common family type in western countries like the UK and the USA, but this is changing. New family structures include one-parent families and families with children from more than one marriage. These new family types are becoming increasingly common. Different family structures mean that many children live with a variety of full, step or half brothers and sisters.  

The first reason is the decline in family size and the increase in single-adult households. In more traditional societies, where families tended to be large, it made economic sense for one person to devote him/herself to time-consuming domestic tasks such as growing and preparing food. Nowadays, people tend to live in even smaller family units. If each family were to spend large amounts of time growing and processing food, this would be a poor use of society’s human resource.