A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of bias in journalism. It does not refer to any previous information and sets the stage for the discussion. It is a general statement about journalists and their biases. Why other lines are not chosen? Paragraph 2 starts with 'Journalists' which makes it dependent on the previous context. Paragraph 3 starts with 'Practically speaking' which is a transitional phrase. Paragraph 4 starts with 'Some perspectives' which refers to ideas not yet introduced.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about bias in journalism. It summarizes the main point that not all views are presented, which reflects the overall theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea of journalists. It explains how journalists try to be fair but still have biases. This shows a logical order from the general statement about bias to a specific example of how journalists act.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it discusses the difficulty journalists face in being fair. It uses 'however' to show contrast, linking the idea of trying to be fair with the challenge of actually doing it.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the result of the difficulty mentioned. It explains that not all perspectives are included, which is a direct consequence of the challenges faced by journalists.