The book's characters came alive in her thoughts.
Meaning: This means that she was able to connect with and understand the characters in the book.
Choice of Words: Came alive means to become active or full of life. Characters are the people or animals in a story. Thoughts are the ideas and feelings that go through your mind. When you put them together, it means that she felt like the characters in the book were real and she could understand their feelings and actions.
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