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听力题目：
15.(A). Professor Graff doesn’t usually write on the blackboard.
(B). Students are rarely bored in Professor Graff’s class.
(C). The professor uses graphs when she lectures.
(D). Students in the graphic arts course don’t take notes.
16.(A). A couple of people left during the discussion.
(B). One person spoke and the others listened.
(C). All but a few people shared their ideas.
(D). Not everyone fully participated in the discussion.
