单选题：The word "this" in Paragraph 6 refers to __________.

题目分类：理工类
题目类型：单选题
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题目内容：

The word "this" in Paragraph 6 refers to __________. A．application of gaze-tracking in human-computer interaction
B．interaction between human and computer
C．combination of gaze-tracking with input on touch devices
D．generalization of Eye Drop system

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