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 newspaper production process. It gives a broad overview of how things have changed over time. 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 "These days" which needs context. Paragraph 3 uses "This is the situation" which also needs earlier information. Paragraph 4 talks about the daily paper but does not introduce the topic. Paragraph 5 starts with "Here" which refers back to something not mentioned yet.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about the newspaper production process. It shows the final outcome of the changes mentioned earlier. It gives a clear conclusion about the role of machines in the process.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of change in the newspaper production process. The phrase "These days" shows a shift from the past to the present. This is a logical order of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains the current situation mentioned in Paragraph 2. The phrase "This is the situation" directly refers back to the changes discussed before.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives more details about how the daily paper is produced. It explains the process mentioned in the previous paragraph, showing a logical order of information.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it talks about the role of machines in the production process. It shows a cause and effect relationship, where the details of the production lead to the fact that machines do most of the work.