单项选择题

According to the passage, the cornea is ________.

A．sensitive
B．irreplaceable
C．healthy
D．defective
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单项选择题
The best candidates for cornea transplants should________.
A．have a very clear cornea
B．have a normal cornea
C．have a cloudy cornea with some diseases such as glaucoma
D．have a defective cornea without any problems concerned with the optic nerve or retina
单项选择题
The word deceased (Line 2, Para. 4) probably means________.
A．died
B．decreased
C．descended
D．given
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