单项选择题

The word "vista" in the last line refers to _______.

A．support
B．prospect
C．history
D．visit
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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.
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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