单项选择题

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

A．4 hours.
B．6 hours.
C．12 hours.
D．18 hours.

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单项选择题

By saying the growth of the proportion...to younger generations. (Line 2, Para. 5), Anthea Tinker really means that ______.

A．currently wealth flows from old generation to younger generation
B．traditionally wealth flows from younger generation to old generation
C．with the increasingly big population of over 50, die trend arises that wealth flows from younger generation to old generation
D．with more and more people of over 50, traditions have been reversed

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