A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic, which is Mount Everest. It gives a broad overview of what the text is about without going into details. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'At 8,849 meters,' which is specific and does not introduce the topic. Paragraph 3 uses 'The first records,' which refers back to something not yet mentioned. Paragraph 4 starts with 'The first ever recorded people,' which also needs context. Paragraph 5 starts with 'They climbed,' which uses a pronoun that needs prior information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the information about Mount Everest and its climbers. It gives a final fact about the record. This follows the rule of Conclusive Words, as it summarizes the main points of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives more information about Mount Everest. It uses the Broader to Specific Strategy. The first sentence talks about the mountain, and the second sentence gives its height.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it talks about the people who climbed the mountain. This follows the Logical Order rule. The second sentence gives a fact about the mountain, and the third sentence tells us who climbed it.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it gives background information about the mountain's height. This uses the Cause and Effect Relationship rule. The third sentence talks about climbers, and the fourth sentence explains when the height was first recorded.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it tells us what happened after the height was recorded. This follows the Chronological Order rule. The fourth sentence gives a historical fact, and the fifth sentence tells us about the climbers.