A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It talks about the time when many new inventions were used. This sets the stage for the discussion about cities and technology. It does not need any other sentence to understand it. It is a general statement that gives an overview of the topic. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "These" which refers back to something, so it cannot be first. Paragraph 3 starts with "This" which also needs context. Paragraph 4 starts with "As a result" which shows it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas. It shows the final result of the discussion about the city and its role in modernist texts. The phrase "As a result" indicates that it is concluding the thoughts presented before.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it uses the word "These". This shows that it talks about the inventions mentioned in the first paragraph. This is a clear link between the two ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains the result of the innovations. The word "This" refers back to the innovations. It shows how these changes affected the city.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it uses the phrase "As a result". This shows that it is talking about the outcome of the city being important. It continues the idea from the previous paragraph.