Sumerian civilization (which lasted from around 3300 to 2000 BCE) ______ many concepts that persist into present-day
civilizations: for example, the ﬁrst description of the seven-day week appears in the Sumerian Epic of Gilgamesh.
transformed
introduced
inherited
overlooked
Choice B is the best answer because it most logically completes the text’s discussion of the contributions of the Sumerian
civilization. In this context, “introduced” means brought into practice or use. The text states that the ﬁrst reference to a
seven-day week appears in the Sumerian Epic of Gilgamesh. The text presents this information about the seven-day week as
an example of a concept introduced by the Sumerian civilization that persists into present-day civilizations. 
Choice A is incorrect because nothing in the text suggests that the Sumerian civilization “transformed,” or changed the
nature of, concepts that persist into present-day civilizations. Instead, the text’s presentation of a Sumerian literary work that
contains the ﬁrst description of the seven-day week is an example of the phenomenon described in the ﬁrst half of the
sentence, suggesting that the Sumerians invented many concepts that still persist. Choice C is incorrect because the
information that a Sumerian literary work includes the ﬁrst description of the seven-day week suggests that Sumerian
civilization may have originated the seven-day week and other concepts that persist into present-day civilizations, not that it
“inherited” the concepts, or received them from an ancestral ﬁgure or culture. Choice D is incorrect because the information
that Sumerian civilization produced the ﬁrst description of the seven-day week is presented as an example of the
phenomenon described in the ﬁrst half of the sentence, suggesting that Sumerian civilization originated this and other
concepts that still persist, not that the Sumerians “overlooked,” or failed to notice or consider, such concepts.