What activity had flourished so much in the Tang and Sung dynasties that it was required during civil service exams?

The arts (including poetry)

Explanation:

The arts flourished during the Tang Dynasty. It was during this time that poetry became an integral part of the Chinese culture. Poetry was a required study for those who wished to pass the civil service exams.

if you have to make a general question and respond to your thoughts, then this isn't really a question someone can you on. read the passage, form your question, and answer using your thoughts. no one else can understand how you interpreted this text if you don't tell us.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )