A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It talks about the hottest month in history, which is a strong start. It does not need any other sentence for context. It sets the stage for the rest of the text. Why other lines are not chosen? Other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "The record" which needs context. Paragraph 3 starts with "The National Oceanic and Atmospheric Administration" which is specific and needs prior information. Paragraph 4 uses "Not only" which shows it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last line because it provides a new perspective on the topic. It ends the discussion by explaining how different organizations may measure temperatures. This gives closure to the overall theme of temperature records.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of heat. The word "record" in Paragraph 2 refers back to the hottest month mentioned in Paragraph 1. This shows a logical flow of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives more details about the record. It explains how the record is not just a single month but part of a longer trend. This shows a broader to specific strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shifts the focus to how temperatures are calculated. This shows a logical order where the discussion moves from the record to how it is measured.