A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main idea about the importance of reading in the modern world. It does not refer to any previous information and sets the stage for the topic. It is a general statement that does not need other sentences for context. Why other lines are not chosen? Paragraph 2 starts with 'Reading as a skill' which refers back to the topic and is not independent. Paragraph 3 starts with 'Studies have shown' which also needs context. Paragraph 4 starts with 'So the skill of reading' which assumes prior knowledge and is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the discussion about reading. It summarizes the main points and shows the overall importance of reading in the economy.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains why reading is important. It uses the 'Broader to Specific Strategy' as it takes the general idea of reading's importance and gives a specific reason about the educated workforce.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it provides evidence for the claim made in Paragraph 2. It follows the 'Logical Order' as it shows how improving skills leads to economic benefits.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it summarizes the overall importance of reading as an economic force. It uses the 'Conclusive Words' strategy as it wraps up the discussion about reading.