单项选择题

Which of the following is NOT a limitation of organ transplantation

A．The organ donor must be young enough.
B．The organ donor must be healthy enough.
C．The organ donated must deserve transplanting.
D．The organ donated must be removed from one body.

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单项选择题

Attempts to make artificial organs fail because______.

A．it is difficult to make artificial organs as natural as body organs
B．it is difficult to imitate the human world
C．the production process is complicated
D．the production is limited by nature

单项选择题

Despite transplant surgeons' work, every year many people die because______.

A．they are unlucky patients
B．organ transplantation is unreliable
C．there are not enough proper organs for transplantation
D．few people are willing to donate their organs after death