How do I find the central idea in a text what are the parts of an informational text

the central idea in a text is the main idea and what the passage is talking about. an informational text is where a passage if talking about real life things and full filling with lots of information. the parts of an informational text are mainly facts.

needs an explanation

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)