单项选择题

What are some of the more astonishing innovations in modem surgery

A．Ears, nose and throat transplants.
B．Values plastic hearts.
C．Plastic heart valves.
D．Leg transplants.
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单项选择题
Most of people are afraid of being operated on _______.
A．in spite of improvements in modem surgery
B．because they think modern drugs are dangerous
C．because they do not believe they need anesthetics
D．unless it is an emergency operation
单项选择题
When has the heart-open surgery been possible
A．Only in the last fifty years.
B．From prehistoric times.
C．Since the nineteenth century.
D．Since the invention of values.
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