A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of health. It shows that being healthy is normal, but many people are not healthy. This is an introductory statement that sets the theme for the rest of the text. It does not refer to any previous information, so it is independent. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "Of course," which is a conjunction. Paragraph 3 uses "There is too much illness," which does not introduce a new idea. Paragraph 4 talks about losing individuals but does not start with a general statement. Paragraph 5 refers back to the individual and does not introduce a new topic.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the main ideas. It shows the overall impact of the previous points about health and loss. It concludes the discussion by stating the value of individuals and how illness affects everyone.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of health. The word "Of course" shows that it is related to the previous statement. This is a logical order because it explains that even if people are well enough to work, they still have health problems.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it summarizes the problems mentioned. It states that there is too much illness and suffering, which is a direct result of the issues in the previous paragraph. This shows a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the impact of the illness and suffering. It shows that many people are lost to illness, which is a logical continuation of the previous idea.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it discusses the value of individuals who are lost. It shows that the loss of these individuals affects not just them, but also their families and society. This is a broader to specific strategy.