Select the meaning of the word 'undulate' in the sentence: 'Each shiver made his muscles undulate beneath his skin.'

Correct Answer: A

Rationale: In this context, 'undulate' means to move in a smooth, wave-like motion. An undulation of muscles is a subtle, continuous rippling or rolling movement, making 'ripple' the most appropriate synonym in this sentence. 'Shake' (Choice B) is incorrect as it implies a more abrupt and irregular movement. 'Flatten' (Choice C) and 'Unknot' (Choice D) are unrelated to the smooth, wave-like motion described in the sentence.

Correct Answer: A

Rationale: Magnesium is another essential electrolyte in the human body, along with sodium, potassium, and calcium. Magnesium plays a crucial role in various bodily functions, including muscle and nerve function, regulating blood pressure, and supporting the immune system. Manganese (Choice B), magnetite (Choice C), and manganite (Choice D) are not electrolytes found in the human body. Manganese is a mineral but not an electrolyte, while magnetite and manganite are compounds and not essential electrolytes for bodily functions.

Correct Answer: B

Rationale: The correct answer is B: 'quite stubborn.' The word 'obdurate' means stubbornly refusing to change one's opinion or course of action. Therefore, if a patient is especially obdurate, it indicates that she is likely very stubborn in her behavior or beliefs. Choices A, C, and D are incorrect because they do not reflect the meaning of 'obdurate.' Being 'very large' (Choice A), 'easily upset' (Choice C), or 'ready to go home' (Choice D) does not directly relate to being stubborn and unwilling to change.

Correct Answer: B

Rationale: The term 'flaccid' is commonly used to describe something that is limp, soft, or lacking firmness. It suggests a lack of stiffness or rigidity, often used to describe plants, muscles, or other objects that are in a drooping or loose state. Choice A 'Light-colored' is incorrect as it does not convey the meaning of flaccid. Choice C 'Uncontaminated' and Choice D 'Unusually aggressive' are also incorrect as they do not relate to the definition of flaccid.

Correct Answer: A

Rationale: In this context, 'undulate' means to move in a smooth, wave-like motion. An undulation of muscles is a subtle, continuous rippling or rolling movement, making 'ripple' the most appropriate synonym in this sentence. 'Shake' (Choice B) is incorrect as it implies a more abrupt and irregular movement. 'Flatten' (Choice C) and 'Unknot' (Choice D) are unrelated to the smooth, wave-like motion described in the sentence.

Correct Answer: A

Rationale: In this context, 'dilute' means to make the medicine less concentrated by adding water or another liquid. It is important to dilute certain medicines to ensure they are safe and effective for a patient's use. Choice B, 'Reduce by half,' is incorrect as diluting does not necessarily mean reducing by half; it means to make less concentrated. Choice C, 'Warm up,' is unrelated to the meaning of dilute. Choice D, 'Decontaminate,' is also incorrect as dilute refers to reducing the concentration of a substance, not removing contaminants.

Correct Answer: C

Rationale: The word 'amalgamate' in the sentence indicates that if the companies come together, combine, or unite as one entity, which aligns with the meaning of 'merge.' Amalgamation often refers to the merging or combining of two or more entities into one. 'Disband' (Choice A) means to break up or dissolve, which is opposite to what happens when companies amalgamate. 'Move' (Choice B) and 'Regroup' (Choice D) are not directly related to the process of companies amalgamating or merging.

Correct Answer: D

Rationale: In this sentence, the word 'trepidation' is used to describe the feeling the students had when approaching the cadaver. Trepidation means a feeling of fear or anxiety about something that may happen, so it aligns most closely with the meaning of 'apprehension.' The students were hesitant or worried about facing the cadaver. Choice A ('Wonder') is incorrect as trepidation does not signify a feeling of wonder. Choice B ('Confusion') is incorrect as trepidation is not about being confused. Choice C ('Eagerness') is incorrect as trepidation is the opposite of eagerness; it indicates hesitation or anxiety, not excitement or enthusiasm.

Correct Answer: B

Rationale: Superfluous means unnecessary or more than what is needed. It refers to something that is excessive or redundant. Choice B, "Excessive," is the correct synonym for superfluous. Choices A, C, and D are incorrect. "Maximum" (Choice A) means the greatest possible amount, "Insipid" (Choice C) means lacking flavor or interest, and "Soggy" (Choice D) means soaked with liquid or water.