A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It talks about hot weather and how many people feel about it. This is an overview of the subject. It does not need any other sentence to understand it. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "The good news," which needs context. Paragraph 3 starts with "Staying cool," which is specific and needs a general idea first. Paragraph 4 talks about avoiding the hottest part of the day, which is a specific action. Paragraph 5 starts with "But if you have to be outside," which also needs a context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it gives the final advice on how to stay safe in the heat. It wraps up the ideas by showing what to do if you must be outside.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives a positive note after discussing the problem of high temperatures. The phrase "The good news" shows a shift from the problem to solutions.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it gives a specific way to feel comfortable in the heat. It explains one of the steps mentioned in Paragraph 2.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it gives another way to stay cool. It continues the idea of how to manage the heat.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it talks about what to do if you cannot avoid being outside. It gives advice on how to protect yourself in the heat.