A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of superpower and its meaning. It does not need any other sentence for context. It is a general statement that sets the stage for the following paragraphs. 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', which is a pronoun and needs context. Paragraph 3 starts with 'In addition', which is a connector and shows it is not independent. Paragraph 4 starts with 'In Montana', which needs prior context. Paragraph 5 starts with 'Especially', which is also a connector. Paragraph 6 starts with 'If', which shows a condition and needs more information. Paragraph 7 starts with 'In either case', which also needs context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about the consequences of the companies' actions. It summarizes the main points and shows the outcomes of the situations discussed in the previous paragraphs.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of superpower. It uses the phrase 'It terms of superpower', which shows it is related to the first paragraph. This is a logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it gives more details about green superpower. It starts with 'In addition to', which shows it is adding information to the previous paragraph. This is a broader to specific strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shifts the focus to companies and their responsibilities. It introduces a new topic but is still related to the overall theme of companies and their actions.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it explains one of the ways companies respond to cleanup demands. It starts with 'Especially if the company is small', which shows it is giving a specific example related to the previous paragraph.
• Pair 5 (Paragraph 5 → Paragraph 6): Paragraph 6 connects to Paragraph 5 because it presents another scenario for companies regarding cleanup costs. It uses 'If the company is so large', which shows a contrast to the previous paragraph.
• Pair 6 (Paragraph 6 → Paragraph 7): Paragraph 7 connects to Paragraph 6 because it summarizes the outcomes of the situations described in the previous paragraph. It uses 'In either case', which shows it is concluding the discussion.