单项选择题

What does Don Black do

A．Letter writer.
B．Operator.
C．Mailman.
D．Milkman.
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单项选择题
Who can make big money in the new century according to the passage
A．Retirees who are business-minded.
B．The volunteer workers in retirement homes.
C．College graduates with an MBA or law degree.
D．Professionals with a good knowledge of gerontology.
单项选择题
It can be seen from the passage that the expansion of America's elderly population ______.
A．will provide good job opportunities in many areas
B．will impose an unbearable burden on society
C．may lead to nursing home abuse and age discrimination
D．will create new fields of study in universities
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