A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It gives a broad overview of the unfinished highway's location. It does not use any words that need prior context. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "It is" which makes it dependent on prior information. Paragraph 3 starts with "Four decades later" which needs context. Paragraph 4 starts with "A glossy brochure" which also needs prior context. Paragraph 5 starts with "It makes" which refers back to something not yet introduced.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the topic. It shows how the unfinished highway is used in modern media. It gives a clear conclusion to the discussion about the highway.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives more detail about the unfinished highway. This follows the Broader to Specific Strategy. The first sentence introduces the highway, and the second sentence describes it.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it shows the time that has passed since the construction stopped. This follows the Chronological Order rule. The second paragraph describes the landmark, and the third paragraph tells us what happened over time.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives an opinion about the highway. This follows the Logical Order rule. The third paragraph talks about the highway's state, and the fourth paragraph shares how it is viewed by others.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it shows how the highway is used in media. This follows the Topic Example rule. The fourth paragraph talks about the brochure's view, and the fifth paragraph gives an example of how it is used.