OG6 阅读 Q5

Choice C is the best answer. The main purpose of Nawab's comments in lines 43-52("Sir...you") is to highlight the labor and service he has provided for Harouni over the years. Nawab says "there is but one man, me, your servant"to take care of the tube wells on all Harouni's vast lands and that the extensive work has resulted in Nawab earning gray hairs on his employer's behalf. 
Choice A is incorrect because even though lines 43-52("Sir...you") initially highlight the vastness of Harouni’s lands, those lines primarily focus on Nawab's dedication and service to Harouni. Choice B is incorrect because lines 43-52("Sir...you") emphasize not that Nawab is competent and reliable but that Nawab feels he is no longer able to adequately fulfill his duties. Choice D is incorrect because in lines 43-52("Sir...you"), Nawab doesn't say he intends to quit his job, asking instead only for help doing it.