How does our brain judge the distance between us and an object?

A．By the effort our eyes make to focus．

B．By the speed at which the object moves．

C．By the time it takes us to touch the object．

D．By the brightness of the light our eyes receive．

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答案解析

推断题。题干意为“我们的大脑是如何判断我们和物体之间距离的?”从文章中第三段第一句和第二句“…your brain measures the effort your eyes make to focus on the object as well as how much they．．．Together，this information allows you to guess how far away the object is．”可知，是大脑通过努力使眼睛集中来判断物体与我们之间的距离。故A正确。

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