Final answer:
The key point in the sentence is that there is a difference between the First Amendment requiring a school to tolerate particular student speech and requiring a school to affirmatively promote particular student speech.
Step-by-step explanation:
The key point in the sentence from Hazelwood School District v. Kuhlmeier is that there is a difference between the First Amendment requiring a school to tolerate particular student speech and requiring a school to affirmatively promote particular student speech.