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
What does the sentence this breakthrough has gained less publicity than have heart transplants and appeals for liver and kidney donors (Para. 1 ) indicate
A．The great progress of cornea transplant is well-known.
B．There are louder voices for liver donors.
C．Kidney donors are rare.
D．Heart transplant is a complicated operation.
单项选择题
According to the passage, the main purpose of cornea transplants is to ________.
A．cure eye diseases
B．replace some of the bad tissues
C．restore vision to patients
D．make people's sight better
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