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
Today, compared with 1910 _______.
A．five times fewer patients die after being operated on
B．20 percent fewer of all operation patients die
C．20 percent of all operation patients recover
D．operation deaths have increased by 20 percent.
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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