单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．They should wait patiently.
B．They should ask that man to leave.
C．They should serve that man immediately.
D．That man is old enough to order things he likes.
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单项选择题
By a well-oiled cog in the machinery the author intends to render the idea that man is ______ .
A．working in complete harmony with the rest of the society
B．a humble component of the society, especially when working smoothly
C．a necessary part of the society though each individual’s function is negligible
D．an unimportant part in comparison with the rest of the society, though functioning smoothly
单项选择题
______ , artificial disc operation is considered a better option than the traditional fusion surgery.
A．Giving patients greater mobility and quicker recovery
B．Suitable for every back-pain sufferers
C．Being less invasive and costly
D．With fewer post-operation side effects
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