A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of totalitarianism. It gives a clear definition of what totalitarianism is. This follows the rule of Topic Sentence. It does not refer to any previous information, so it stands alone. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with 'Such government,' which refers back to the idea of totalitarianism. Paragraph 3 uses a quote and is specific, so it cannot stand alone. Paragraph 4 mentions 'the manifestation of totalitarianism,' which also needs context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the impact of totalitarianism in history. It wraps up the discussion about totalitarianism. This follows the rule of Summary Style.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea of totalitarianism. The phrase 'Such government' refers back to the totalitarianism mentioned in Paragraph 1. This follows the Noun Pronoun Rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains more about the type of government mentioned. It gives specific factors of totalitarianism. This follows the Broader to Specific Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows how totalitarianism was seen in history. It gives an example of how totalitarianism appeared in the 20th century. This follows the Logical Order.
• Pair 4 (Paragraph 4 → Paragraph 5): There is no fifth paragraph, so this is the end of the sequence.