Answer:
The central Idea is "For many reasons, notable people sometimes avoid revealing their private identity".
Explanation:
If you read the text the author clearly expresses his/her feeling based on that one topic. The main idea is implied. (are those multiple answers or a text I'm not sure)
Answer:
I am pretty sure that "one" is the othe pronoun.
Explanation:
One is like an impersonal pronoun, can be used for people or as an indefinite pronoun. Instead of saying stamps again, they use "one" to replace it. Hope that helps.
The echoing sound of his voice shows his excitement that his brother is communicating