详解
Choice D is the best answer. In lines 48-53("If ...sentinels"), the narrator states that he exhibited "Caution, Tact, [and] Observation"at work and watched Mr. Crimsworth with "lynx-eyes." The narrator acknowledges that Crimsworth was"prepared to steal snake-like"if he caught the narrator acting without tact or being disrespectful toward his superiors (lines 53-56,"baffle...sleeps"). Thus, Crimsworth was trying to find a reason to place the narrator "in a ridiculous or mortifying position"(lines 49-50,"ridiculous ...much") by accusing the narrator of acting unprofessionally. The use of the lynx and snake serve to emphasize the narrator and Crimsworth's adversarial, or hostile, relationship.
Choices A and B are incorrect because the description of the lynx and snake does not contrast two hypothetical courses of action or convey a resolution. Choice C is incorrect because while lines 48-56 ("If ...sleeps") suggest that Crimsworth is trying to find a reason to fault the narrator's work, they do not imply that an altercation, or heated dispute, between the narrator and Crimsworth is likely to occur.