A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main idea about teaching. It is a general statement that does not need other sentences for context. It sets up the topic without going into details. Why other lines are not chosen? Paragraph 2 starts with "It is incorrectly assumed" which makes it dependent on prior context. Paragraph 3 starts with "We know" which also needs context. Paragraph 4 starts with "However" which shows it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It gives a final thought about the importance of teaching after discussing learning without it.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea about teaching. The word "assumed" shows that it is talking about a belief related to the topic of teaching.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives an example of learning without teaching. This shows a contrast to the assumption made in Paragraph 2.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it presents a different view. The word "However" shows that it contrasts with the idea that children can learn without teaching.