单选题
"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
【正确答案】
B
【答案解析】
根据第二段的第一句话“…in studies of days of disability per person per year”可以看出B项正确。
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