单项选择题

A．In a tube in New York.
B．On a train to New York.
C．In a car in Florida.
D．On a train to Florida.
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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.
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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