The National Institutes of Health says adults need seven hours to nine hours of sleep for good health.Regularly getting too little sleep increases the risk of health problems，including memory impairment and a weakened immune system.More immediately，too little sleep affects reaction times；sleepiness is to blame for car crashes and other accidents.

　　It has critically important complicated and unexpected results for anyone who works “crazy hours” and thinks they are performing fine with a few hours of weeknight sleep，said Harris，director at New York’s Montefiore Medical Center.“Don’t think you can just bank_up your sleep on the weekend，because it doesn’t work that way，” he warned.

　　61．The text mainly advises people________.

　　A．to sleep more time

　　B．to sleep in on Saturday

　　C．to sleep scientifically

　　D．to sleep little on weekend

　　62．People with long­term sleep loss________.

　　A．are quicker in thinking

　　B．may feel refreshed soon after waking up

　　C．are surely energetic

　　D．can have a strong sense of security

　　63．What can we learn from the text?

　　A．Most of the Americans get six hours or less of sleep a night.

　　B．Staying up is worse for those who suffer long­term sleep loss.

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