单项选择题

It can inferred from Par

A．4 that the author is ______.A. dubious about the expert's claimB. opposed to tax cutsC. doubtful about the effectiveness of the new pillsD. 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 (Par

A．3), the author means that ______.A. any human being may be down with insomniaB. any style of life can lead to insomniaC. any fragment of life can cause insomniaD. any day of life can result in insomnia