While visiting the robot exhibition, the professor kept nodding his head to express his w

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A. description
B. congratulation
C. ambition
(答案→)D. satisfaction
解析：考查短语辨析，description 描述，congratulation 祝贺，ambition 雄心，satisfaction 满意，句意：当参观机器人展览的时候，这位教授一直在点头来表达他对学生们的作品表示满意。所以选D。