A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of absolute location. It gives a clear definition without needing other sentences for context. 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 "It is more precise..." which uses a pronoun and needs the first sentence for context. Paragraph 3 starts with "In contrast..." which is a conjunction. Paragraph 4 starts with "Nowadays..." which does not introduce the topic. Paragraph 5 starts with "This software..." which uses a pronoun that refers back to something not yet mentioned.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the topic by explaining how the software works. It provides a clear conclusion about the use of GPS in finding absolute location.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains more about absolute location. It uses the Connector strategy by saying it is more precise than relative location.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it contrasts relative location with absolute location. It uses the Contrast rule to show the difference.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shifts focus back to absolute location. It uses the Logical Order strategy by moving from discussing relative location to how to find absolute location.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it explains how the geolocation software works. It uses the Broader to Specific strategy by first mentioning the software and then explaining its function.