First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main idea about being careful with how science is reported. It sets the stage for the discussion about science and its reporting. It does not refer to any previous information, making it independent. Why other lines are not chosen? Paragraph 2 starts with "Of course," which is a conjunction. Paragraph 3 starts with "The role of science," which uses the definite article "the" and assumes prior knowledge. Paragraph 4 starts with "Mobile phones, for example," which is not a complete thought. Paragraph 5 starts with "But no one would argue," which is also a conjunction.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about mobile phones. It shows that while there are risks, mobile phones are still important in emergencies. This gives a clear conclusion to the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of being cautious about science. The phrase "Of course" shows that it is adding to the previous thought.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it shifts the focus to the importance of science. It shows a logical order by moving from discussing dishonesty to stating the value of science.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives an example of how science, like mobile phones, can have both good and bad effects. This shows a broader to specific strategy.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it contrasts the negative effects of mobile phones with their positive use in emergencies. The word "But" shows this contrast.