A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of foreign investment and its risks. It uses the rule of Topic Sentence because it talks about risks from exchange rate loans. It does not refer to any previous information, so it stands alone. Why other lines are not chosen? Paragraph 2 starts with "In addition," which is a conjunction. Paragraph 3 starts with "In view of," which is also a conjunction. Paragraph 4 starts with "A multinational company," which uses a definite article "the" that assumes prior knowledge. Therefore, they do not qualify as independent sentences.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about foreign investment and the risks involved. It uses the rule of Summary Style because it brings together the earlier points about risks and expectations of returns.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 using the Connector Strategy. The phrase "In addition" shows that it adds more information about foreign investment, linking it to the risks mentioned in Paragraph 1.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 using the Logical Order rule. It continues the discussion about foreign investment by explaining that because of the higher risk, firms expect higher returns.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 using the Cause and Effect Relationship rule. It explains that the expectation of higher returns can lead to accusations of 'profiteering,' showing a direct link between the two ideas.