单项选择题

A． why do people fall asleep
B． three kinds of sleep disorders
C． the treatment for sleep disorders
D． staying up too late can be harmful
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根据财政部昨天公布的统计数字，上一季度的失业率下降了约0.5个百分点，经济学家认为这是经济复苏的强烈信号。[听力原文]According to the statistics issued by the Finance Ministry yesterday, the unemployment rate of last quarter decreased by almost 0.5%, and economists believe that it is a strong signal of economic recovery.
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