Question

which of juliets lines best shows that she understands romeos identity? you kiss by the book. my only love sprung from my only hate! it is an honour that i dream not of. but no more deep will i endart mine eye

Explanation:

In "My only love sprung from my only hate!", Juliet expresses that her love (for Romeo) has emerged from her family - based hatred (the feud between the Capulets and Montagues), showing she understands Romeo is from the rival family.

Answer:

My only love sprung from my only hate!