单项选择题


A．At 11:23.
B．At 11:17.
C．At 11:40.
D．At 12:00.
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单项选择题
Whom is Mark’s retinal prosthesis ready for
A．For those who have been blind from birth.
B．For those who still have faint vision.
C．For the blind who once had eyesight.
D．For those who still have one healthy eye.
单项选择题
A．callsB．commentsC．workD．demands
A．calls
B．comments
C．work
D．demands
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