Correct Answer: C

Rationale: The correct answer is C: 'Objective.' The passage presents a factual account of Clara Barton's life events without showing bias or personal feelings. The text outlines significant milestones in Barton's life chronologically, from her birth to her contributions during and after the Civil War, culminating in her advocacy for the establishment of an American branch of the International Red Cross Organization. The passage does not exhibit a patronizing tone (choice A), as it does not talk down to Barton or belittle her achievements. It is also not skeptical (choice B), as it does not express doubt or disbelief in the information presented. Furthermore, the passage is not nostalgic (choice D), as it does not dwell on sentimental feelings or memories of the past. Therefore, 'Objective' is the most suitable description of the passage's theme.

Correct Answer: C

Rationale: The author's tone in the passage is informal. The passage provides a narrative about Hedy Lamarr's life and inventions, offering insights into her challenges and achievements in a conversational manner. The use of phrases like 'To relieve this boredom' and 'Just think, we might not have any of those things' indicates a casual and engaging tone, suitable for storytelling. Choice A, 'Sarcastic,' is incorrect as there is no evident use of sarcasm or irony in the passage. Choice B, 'Formal,' is incorrect because the tone is not stiff or ceremonious; instead, it is relaxed and personal. Choice D, 'Scientific,' is also incorrect as the tone is not focused on presenting technical information or research findings but rather on sharing a personal story.

Correct Answer: A

Rationale: The passage outlines significant events in Clara Barton's life, starting from her birth in Massachusetts, moving to Washington D.C., her humanitarian work during the Civil War, and her later efforts in Europe and with the Red Cross. The most accurate subtitle for this passage would be 'The start of the revolution,' as it refers to the beginning and progression of Barton's revolutionary work in humanitarian aid and establishing the American branch of the International Red Cross Organization. The other choices are not suitable subtitles as they do not encompass the breadth of Barton's impactful life events described in the passage.

Correct Answer: B

Rationale: The correct answer is B. The US Navy preferred to utilize technology developed by military engineers rather than consider Lamarr's invention. Choice A is incorrect because Hollywood containing spies is not relevant to why the US was not interested in Lamarr's invention. Choice C is incorrect as there is no mention of the military being too preoccupied to consider new inventions in the provided context. Choice D is incorrect as there is no indication that the US suspected Lamarr's patent to be invalid; rather, the focus was on the navy's preference for technology developed by military engineers.

Correct Answer: C

Rationale: The most relevant source for data on the effects of mobile use on consumers' hearing would be a university research paper about decibel limits of headphones and speakers. This source would provide specific information on how mobile use could potentially impact hearing due to the sound levels produced by headphones and speakers. Choice A discusses surcharges on bills, which is unrelated to hearing effects. Choice B focuses on the incidence of hearing loss in general, not specifically related to mobile use. Choice D, a statistical report on mobile phone usage, may not directly address the impact on consumers' hearing.