单项选择题

A picture remains on the retina for ______.

A．6 seconds
B．second
C．16 seconds
D．1/6 of a second
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单项选择题
The result of Plateau's first experiment was that ______.
A．he went permanently blind
B．he stopped staring into the sun
C．he went blind for a month
D．he found what he was looking for
单项选择题
The images that we see are recorded in ______.
A．the brain
B．the eye
C．the retina of eye
D．the pupil
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