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: To aspirate fluid, you would typically use a syringe. A syringe is a device consisting of a tube and a plunger, which allows you to draw fluids such as blood or medication into the tube by pulling back on the plunger. This action is called aspiration, and the syringe is a common tool for this purpose in various medical procedures. Choices B, C, and D are incorrect as they are not typically used for aspiration procedures. A beaker is a glass container used for holding liquids, a test tube is used for holding or mixing small quantities of substances, and a flange is a projecting rim or edge used for strength or for attaching to another object.

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: C

Rationale: When someone is at the zenith of their career, it means they have reached the highest point or peak of success in their professional life. This suggests that they have achieved their utmost potential and are enjoying the height of their career accomplishments. Choice A, 'just getting started,' is incorrect as it implies the beginning of a career rather than the peak. Choice B, 'preparing for retirement,' is incorrect because being at the zenith of one's career usually signifies the prime of one's professional success, not the preparation for retirement. Choice D, 'having trouble with your superiors,' is incorrect as it is unrelated to the concept of reaching the peak of success in one's career.

Correct Answer: D

Rationale: In this context, the word 'tenuous' is used to describe a weak or delicate hold on reality. 'Fragile' is the correct choice as it conveys the idea of something being easily broken or damaged, which aligns with the meaning of 'tenuous' in the sentence. Choice A, 'Judicious,' means having good judgment, which is unrelated to the context. Choice B, 'Deleted,' means removed or erased, which is not synonymous with 'tenuous.' Choice C, 'Frantic,' means panicked or desperate, which does not capture the delicate or weak nature implied by 'tenuous.'