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 general impressions of skilled negotiators. This is an overview of what the text will discuss. It does not refer to any previous information. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Feelings', which is a pronoun that refers back to the feelings mentioned in Paragraph 1. Paragraph 3 starts with 'Hence', which is a conjunction. Paragraph 4 starts with 'The results', which uses the definite article 'the' and assumes prior knowledge. Paragraph 5 starts with 'This', which is also a pronoun referring back to previous ideas.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It contrasts the information about internal and external events. This is a Conclusive Words strategy, as it shows the final thoughts on the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it explains more about the feelings mentioned in Paragraph 1. This is a Broader to Specific Strategy. The first paragraph gives a general idea about skilled negotiators, and the second paragraph gives specific information about feelings.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains what the researchers did because feelings are not observable. This shows a Cause and Effect Relationship. The second paragraph states a problem, and the third paragraph explains the solution.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows the results of the method used. This is a Logical Order. The third paragraph explains the method, and the fourth paragraph gives the results of that method.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it contrasts the information about internal events with external events. This is a Contrast strategy. The fourth paragraph talks about internal events, and the fifth paragraph discusses external events.