Question

1. what question should you ask to figure out if a piece of information is the main idea?

is this information at the very beginning?
does this explain the title of the passage?
is this what the entire passage is mostly about?
is this the last detail given?

Explanation:

To figure out the main - idea of a piece of information, one should ask if the information represents what the entire passage is mostly about. The other questions focus on details, title - explanation, or the last detail, not the main idea.

Answer:

"Is this what the entire passage is mostly about?"