单项选择题

It can inferred from Para. 4 that the author is________.

A．dubious about the expert's claim
B．opposed to tax cuts
C．doubtful about the effectiveness of the new pills
D．happy about the economic situation
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单项选择题
According to the passage, insufficient sleep is harmful in that it can cause all BUT ________of the following.
A．poor eyesight
B．premature aging
C．odd behavior
D．loss of orientation
单项选择题
By saying insomnia is caused by life (Para. 3), the author means that________.
A．any human being may be down with insomnia
B．any style of life can lead to insomnia
C．any fragment of life can cause insomnia
D．any day of life can result in insomnia
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