单项选择题

The most striking contrast in mortality can be found between ________.

A．different areas
B．different races
C．different families
D．different income groups
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单项选择题
From the passage (as the beginning paragraphs of a long article), it is very likely that the writer will go on to discuss ________.
A．how to eliminate poverty in the U.S.A.
B．how to gather nationwide mortality statistics by income
C．how to help those poor people who are sick
D．how to train more qualified doctors for the rich people.
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