In the past, traditional industry was the pillar of industry, and scarce natural resources were the main support, while knowledge economy was based on high technology.

We should pay attention to the key words and sentences related to knowledge economy and integrate them. The first sentence is about the characteristics of the traditional economy, which has nothing to do with it. The second sentence "knowledge economy takes high-tech industry as the primary industrial pillar and intellectual resources as the primary support" is obviously the most critical sentence. In the third sentence, we should pay attention to the two key words of "sustainable development and new type" of knowledge economy, and then determine the sentence.

Example of answer:

Knowledge economy is a new economy with high-tech industry as the primary industry pillar and intellectual resources as the first support.