Correct Answer: D

Rationale: The primary purpose is to analyze the various aspects of concussions.

Correct Answer: B

Rationale: The main idea of the passage about High Fructose Corn Syrup is that it may be contributing to obesity in America. This is evident from the information provided in the extract, which discusses how HFCS has been linked to health issues, including obesity. Choice A is incorrect because the passage primarily focuses on the potential health risks associated with HFCS consumption, not just the examination by the American Medical Association. Choice C is irrelevant as it only talks about the manufacturing process of HFCS, which is not the central theme of the passage. Choice D is incorrect as it emphasizes the preference of rats for HFCS, which is a minor point compared to the potential impact on human health, particularly in relation to obesity.

Correct Answer: C

Rationale: The summary accurately reflects the balanced view of the benefits and risks of sunlight.

Correct Answer: D

Rationale: The best title for the passage about Hypertension is 'Causes, Symptoms, Complications, and Management of Hypertension.' This title accurately reflects the content of the passage, which provides information about the causes, symptoms, complications, and management of hypertension. It covers a broad spectrum of information presented in the passage, making it the most comprehensive and suitable title. Choice A, 'How to Manage Hypertension Successfully,' is too narrow as it focuses solely on management without encompassing the other crucial aspects like causes and symptoms. Choice B, 'Doctors Discover the Hidden Dangers of Hypertension,' is misleading as the passage does not focus on any recent discoveries but rather provides general information about hypertension. Choice C, 'Doctors Work to Understand the Causes of Hypertension,' is also inaccurate as the passage mainly discusses causes, symptoms, complications, and management, rather than doctors' ongoing research efforts.

Correct Answer: D

Rationale: The correct answer is D because the passage does not mention anything about vitamin and mineral deficiencies in relation to sickle-cell anemia. Choice A is incorrect as the passage specifies that sickle-cell anemia is more common among people of South American or African descent. Choice B is correct as the passage states that symptoms of sickle-cell anemia can include sudden occurrences of extreme abdominal and back pain. Choice C is correct as the passage describes that the red blood cells of sickle-cell patients are unusually shaped, forming crescent or sickle shapes. The passage does not discuss any relationship between vitamin and mineral deficiencies and sickle-cell anemia, making choice D the correct option.