Bhagavad Gita, Chapter 8, Verse 1

Arjuna said: What is that Brahman, what is Adhyâtma, what is Karma, O best of Purushas? What is called Adhibhuta, and what Adhidaiva?

Arjuna doesn't let the last chapter's new terms just pass by, he asks what they actually mean.

Krishna introduced several real, specific concepts at the close of Chapter 7, and Arjuna doesn't pretend to already understand them. He asks directly, several genuine questions in a row, rather than nodding along.