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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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
From the passage we can conclude that________.
A．most of the worrying follows certain reasons
B．people feel very funny when they are involved in worries
C．worry will never cause any health problems
D．worry can be reduced with substitute habits
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