题目内容
The research project involves() the careers of 400 graduates.
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()is the smallest intensity of a stimulus that must be present for it to be detected.
()are primarily responsible for the sharply focused perception of color, particularly in brightly lit situations
In (), perception is guided by higher-level knowledge, experience, expectations, and motivations.
The ability to view the world in three dimensions and to perceive distance—a skill known as depth perception—is due largely to the fact that we have ().
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