A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It clearly states that the European Union has two big fish problems. This is an overview of what the text will discuss. It does not refer to any previous information, so it is independent. Why other lines are not chosen? Paragraph 2 starts with "One is that," which means it needs more context. Paragraph 3 starts with "The other is that," which also needs context. Paragraph 4 starts with "The EU has tried to solve both problems," which assumes prior knowledge. Paragraph 5 starts with "As a result," which shows it is based on earlier information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the discussion. It shows the result of the EU's actions and wraps up the main ideas. It reflects on the overall theme of the problems and their effects.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives the first problem. It uses the word "One" to show it is the first issue related to the two problems mentioned in Paragraph 1. This is a logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it gives the second problem. It uses the word "The other" to show it is the second issue. This follows the logical order of presenting two problems.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows how the EU is trying to solve the problems mentioned in Paragraph 3. It logically follows that after stating the problems, the text explains the solutions.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it shows the effect of the EU's actions. The phrase "As a result" indicates that what happens in Senegal is a consequence of the EU's actions described in Paragraph 4.