A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main idea of traveling at high speeds. It sets the stage for the discussion about how the present feels when traveling fast. It does not refer to any previous information, making it an independent sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "But" which is a conjunction, so it cannot be first. Paragraph 3 uses "By traveling like this," which refers back to traveling, so it is not independent. Paragraph 4 starts with "The traveler on foot," which uses the definite article "the" and assumes prior knowledge. Paragraph 5 starts with "For him," which uses a pronoun and also assumes prior context.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about traveling and experiencing the present. It provides a clear conclusion about how a traveler on foot feels about traveling and arriving.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it shows a contrast. The word "But" is a connector that shows a change in thought. It explains that even when you arrive, it does not matter, which follows the idea of living in the future.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains the effect of the meaningless arrival. It shows a cause and effect relationship. When you arrive, you stop experiencing life, which follows the idea of moving on.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it introduces a contrast. It shows the difference between fast travel and walking. The phrase "on the other hand" is a connector that highlights this difference.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives more detail about the traveler on foot. It explains how this traveler experiences the present, which follows the idea of living in the moment.