Correct Answer: B

Rationale: The tone is uncertain because the author raises questions about the efficacy of aromatherapy.

Correct Answer: D

Rationale: The correct answer is D. The passage focuses on describing sickle-cell anemia as a painful and inherited disease. It details how the abnormal sickle-shaped cells cause symptoms like bone pain, fever, and fatigue. While bone pain is mentioned as a symptom, it is not the main idea of the passage. Choice A is incorrect. Choice B, which mentions oxygen transport, is not the main idea but a general concept. Choice C, stating genetically inherited diseases affect thousands, is too broad and does not focus on the specifics of sickle-cell anemia. Therefore, D is the most precise choice.

Correct Answer: D

Rationale: Consensus in this context refers to unanimity, meaning a general agreement among people.

Correct Answer: D

Rationale: The passage does not suggest that super foods are more expensive than processed foods.

Correct Answer: C

Rationale: Tolerance in this context refers to endurance, particularly in relation to pain.