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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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
Millions do it In this sentence do it refers to _______.
A．feeling uncomfortably not on the equator
B．flying over the North Pole
C．flying over the equator
D．making homes on the equator
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