从最浅显的认知来看，part 3相对part 1在回答的内容量的方面要更多一些。我们来看一个例子：
Are there many traffic jams in your city?
Yes, especially in rush hour, there are so many cars on the road, and sometimes people are stuck for hours.
Yes, definitely. I think that’s probably because our living standard has improved and lots of families are able to buy a car for convenience and comfort. As a result, the road is always crowded with cars in the morning and evening when people travel to and from work.
Part 3相对part 1来讲问题会问得更加的抽象。所谓抽象其实就是问题涉及到的东西不再是和自己有直接的关系，更多是涉及到国家、社会，乃至全世界、全人类。
What do you think of advertisements?
I think advertisements are annoying. They often pop up when I’m watching my favorite TV show or browsing a website.
What kind of role does advertising play in our society?
Well, advertisements are a way to spread information about consumer goods. They inform people of the latest products by introducing functions or uses in vivid pictures so that potential buyers can make decisions based on what they see from these ads. In a way, I think advertisements increase consumption and boost the economy.
In China, how has shopping changed in the past few decades?
In the past, say, 20 years ago, people did their shopping mostly in a shopping mall or department store, where they had to walk from store to store to compare prices and pay in cash.However, now we have internet and cellphones so purchases can be made electronically, and physical presence and cash are no longer necessary.
大家注意答案中的词汇替换：do shopping vs. make purchases/ in a shopping mall or department vs. electronically/ walk from store to store vs. physical presence/ had to vs. necessary
当然，句型也出现了从people作主语到抽象名词(physical presence and cash )作主语的转变。