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Lack of Sleep Increases the Risk of Catching a Cold

As cold season approaches, many Americans stock up on their vitamin C and Echinacea (紫锥花精油). But fallowing the age -old advice about catching up on sleep might be more important.
Studies have demonstrated that poor sleep and susceptibility (易受影响) to colds go hand in hand, and scientists think it could be a reflection of the role sleep plays in maintaining the body’s defenses.
In a recent study for the Archives of Internal Medicine, scientists followed 153 men and women for two weeks, keeping mack of their quality and duration of sleep. Then, during a five - day period, they quarantined (进行检疫隔离) the subjects and exposed them to cold viruses. Those who slept an average of fewer than seven hours a night, it turned out, were three times as likely to get sick as those who averaged at least eight hours.
Sleep and immunity, it seems, are tightly linked
A. Scientists have proved the link between sleep and immunity.
B. Mammals that require the most sleep produce more blood cells.
C. Species that sleep more have greater resistance against pathogens.
D. Red blood cells help the body to fight against diseases.

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[单项选择]

Lack of Sleep Increases the Risk of Catching a Cold

As cold season approaches, many Americans stock up on their vitamin C and Echinacea(紫锥花精油). But following the age -old advice about catching up on sleep might be more important.
Studies have demonstrated that poor sleep and susceptibility (易受影响) to colds go hand in hand, and scientists think it could be a reflection of the role sleep plays in maintaining the body’s defenses.
In a recent study for the Archives of Internal Medicine, scientists followed 153 men and women for two weeks, keeping track of their quality and duration of sleep. Then, during a five - day period, they quarantined(进行检疫隔离) the subjects and exposed them to cold viruses. Those who slept an average of fewer than seven hours a night, it turned out, were three times as likely to get sick as those who averaged at least eight hours.
Sleep and immunity, it seems, are tightly linked. Studies have found that
A. They take vitamin C and use Echinacea.
B. They sleep more as the scientists suggest.
C. They try to stay indoors as much as possible.
D. They sleep less to make time for exercis

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