1. D. a university library
2. The text mentions "every imaginable field of study," including literature, history, biography, geography, and "every branch of science." It also describes students studying, some wearing headphones, and one even asleep—behaviors common in a university setting where students often spend long hours studying. The sheer size and scope of the collection, along with the presence of serious, focused students, strongly suggest a university library rather than a smaller community, elementary, or high school library.
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