单选题：he 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：

he 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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答案解析：

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