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

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热门试题

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

单项选择题

The danger of transplanting animal organs into humans is that______.

A．it is considered ethically wrong
B．it may bring diseases into human bodies
C．it brings parasites into human bodies
D．it does more harm than good to humans