7. Which choice best describes the relationship between the two passages? A. Passage 1 mainly discusses the National Radio Quiet Zone in general, while Passage 2 mainly discusses a particular threat to the zone's integrity. B. Passage 1 focuses on Green Bank,West Virginia, while Passage 2 focuses on the National Radio Quiet Zone surrounding the town. C. Passage 1 evaluates drawbacks of the National Radio Quiet Zone,while Passage 2 evaluates benefits of the zone. D. Passage 1 offers praise for astronomers, while Passage 2 offers criticism of astronomers.