A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main event, which is the neutron summer school. It gives the date and place, which is important information. This follows the rule of Topic Sentence because it sets up the main topic without going into details. Why other lines are not chosen? The other paragraphs do not qualify as the first sentence. - Paragraph 2 starts with "For more information," which is a transitional phrase. - Paragraph 3 starts with "The theory will be presented," which refers to a topic that needs prior context. - Paragraph 4 starts with "The aim of the school," which assumes knowledge of the school mentioned in Paragraph 1.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it provides a way for readers to get more information. It wraps up the text by directing readers to the source for further details. This follows the Conclusive Words rule, as it gives a final point about where to find more information.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because the second paragraph explains what the school will cover. This follows the Broader to Specific Strategy. The first paragraph gives general information about the school, and the second paragraph gives specific details about the topics.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because the third paragraph explains how the theory will be presented. This follows the Logical Order rule. The second paragraph talks about the topics, and the third paragraph explains how the theory relates to those topics.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because the fourth paragraph gives a way to find more information about the school. This follows the Topic Example rule. The third paragraph talks about the theory, and the fourth paragraph provides a source for more details.