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.
单项选择题
Restricted activity days are days when ________.
A．sick people have to stay in hospital for further treatment
B．one takes a long holiday away from work
C．sick people have to keep from their normal activities
D．one is restricted in his freedom of action
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