Correct Answer: A

Rationale: The word 'permeable' refers to a material or surface that allows liquids, gases, or substances to pass through it, while screening or filtering out impurities. This makes it an appropriate descriptor for a screen or filter, which function by allowing certain elements to pass through while retaining others. Choices B, C, and D are incorrect: 'Incendiary' means causing fires, 'Exuding' means giving off or releasing, and 'Resilient' means able to withstand or recover from difficult conditions.

Correct Answer: C

Rationale: The word 'venal' means susceptible to corruption, especially by bribery. It is often used to describe individuals who are willing to do dishonest or immoral acts in exchange for money or favors. Therefore, the most appropriate synonym for 'venal' among the given choices is 'greedy.' 'Vibrant' means full of energy and life, 'savage' refers to fierce or violent behavior, and 'fortunate' means having good luck or being favored by fortune, none of which capture the meaning of 'venal.'

Correct Answer: D

Rationale: In this context, the word 'sanctioned' means to authorize or approve. The sentence indicates that the professor gave permission for the field trip to the chemistry lab, which aligns with the meaning of 'authorized.' Choices A, B, and C are incorrect. 'Organized' does not fit the context as the sentence is about granting approval, not arranging. 'Deterred' means to discourage, which is the opposite of what the professor did. 'Neglected' means failed to care for or pay attention to, which is unrelated to the professor approving the field trip.

Correct Answer: D

Rationale: In the sentence provided, the word 'persistent' is used to describe the cold, indicating that it has been lasting for a long time without going away easily. This choice emphasizes the prolonged nature of the cold. Choices A, B, and C are incorrect because 'persistent' does not mean 'typical,' 'harmless,' or 'without cure' in this context. The key is to focus on the word's meaning in relation to the duration of the cold.

Correct Answer: B

Rationale: The correct answer is B: Dormant. Latent and dormant are synonymous and refer to something existing but not currently active or evident. Choice A, 'Flagrant,' means something that is conspicuously offensive, blatant, or glaring, which is the opposite of latent. Choice C, 'Deceased,' means no longer alive, which is unrelated to latent. Choice D, 'Postponed,' means to delay or reschedule to a later time, which is not synonymous with latent.