Correct Answer: B

Rationale: The word 'ameliorate' means to improve or make something better. In this sentence, the question is asking whether the dosage made the tenderness better, indicating an improvement in the condition. Therefore, the correct meaning of 'ameliorate' is to improve, making option B the correct choice. Choices A, C, and D are incorrect as they do not accurately reflect the meaning of 'ameliorate' in the context provided.

Correct Answer: D

Rationale: The abbreviation CDC stands for the Centers for Disease Control and Prevention, which is a well-known public health association in the United States. The CDC is a federal agency under the Department of Health and Human Services, responsible for protecting public health and safety by controlling and preventing disease, injury, and disability. Choices A, B, and C are incorrect as they do not accurately describe what the CDC is known for; it is not an online social network, a test for postgraduate students, or a pharmaceutical company.

Correct Answer: C

Rationale: Enervated refers to being weakened or lacking energy, so an enervated patient would likely be fatigued or tired. This term does not specifically imply anxiety, immaturity, or fear, making 'tired' the most suitable choice in this context. 'Anxious' (choice A) means feeling nervous or worried, which is not directly related to being enervated. 'Immature' (choice B) refers to lacking maturity or development, which is unrelated to the patient's energy level. 'Frightened' (choice D) means feeling afraid or scared, which is not necessarily connected to being enervated.

Correct Answer: D

Rationale: The correct answer is D, 'Emotional behavior.' Histrionics refer to exaggerated or dramatic emotional behavior, often characterized by theatricality or over-the-top expressions of emotions. It is more related to dramatic and exaggerated emotional displays rather than accomplishments, daring acts, or examinations. Choices A, B, and C are incorrect because histrionics specifically pertain to emotional behavior and not achievements, daring actions, or assessments.

Correct Answer: D

Rationale: In this sentence, the word 'waft' is used to describe the movement of dry leaves over the creek in response to the steady breeze. 'Waft' means to float gently through the air. The correct meaning of 'waft' in this context is to float. Choices A, B, and C are incorrect because 'sink' means to go down below the surface of something, 'dive' means to plunge headfirst into water or another substance, and 'wave' means to move one's hand to and fro in greeting or as a signal.