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 images that we see are recorded in ______.
A．the brain
B．the eye
C．the retina of eye
D．the pupil
单项选择题
Jack speaks to me ______ he were my teacher.
A．even though
B．if
C．even if
D．as if
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