【阅读】
标题：generalizing
定义：In the lecture, the professor introduces the concept of generalizing which means children are able to realize that a word doesn't only mean a specific object but also other means other objects of the same category as they grow up.
听力要点
【听力】
例子:He offers us an example of his own son. When he was much younger, he learnt the word 'train', at first his understanding of this word was pretty limited, he thought it only referred to his toy train. But as he grew up, it came to his understanding that the word 'train' not only refers to his toy train but also other real trains in life. That's how the professor uses the example of his son to illustrate the concept of generalizing.
第3题来源：北美话题分类：Business属性：小范围核心预测
话题
S4
阅读要点
【阅读】
标题：Concept testing
定义：A marketing technique company use to find out if customer likes a new product idea. Two benefits: to gain information; use feedbacks to improve the product.
听力要点
【听力】
例子: A bicycle company introduced a folding bike. Marketing people talk to a group of consumers. Information gathering: consumers like the folding back. New feedback: wants to have an attached lock. And the company adapted the product and the bike sells well.
第4题来源：北美话题分类：Animal属性：小范围核心预测
话题
S4
阅读要点
【阅读】
标题：Compound Nesting
定义：Two species live together, which are different enough not to compete for food.
听力要点
【听力】
例子: Example of Ants in Africa. The bigger ant collects food, and the smaller one eats the left over scrambles. For the smaller one, it doesn't need to search for food. For the bigger one, the smaller one makes the nest clean by eating the left over food, which prevents bacteria.
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