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 asks a question about macchiato and cappuccino, which sets the stage for the discussion. This follows the rule of Topic Sentence. Why other lines are not choosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "Well," which is a conjunction. Paragraph 3 talks about macchiato without introducing the topic first. Paragraph 4 also refers to ordering but does not ask a question.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about cappuccino after explaining macchiato. It provides a complete comparison, which follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the thought about understanding the differences. This follows the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives specific information about macchiato after stating that differences should be understood. This follows the Broader to Specific Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it provides information about cappuccino after discussing macchiato. This follows the Object Subject Strategy.