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    We spend about one-third of our lives asleepThis may sould like a lot of timebut it is not wastedOur bodies need sleep to stay healthyNot getting enough aleep can make us sick

    Sleep and our immune(免疫)system

    The immune system protects the body from diseases and infections(传染).Not getting enough sleep hurts this protective system

    The Mayo Clinic is a research hospital in the United StatesIts website explains that when we sleep our bodies produce proteins(蛋白质)that support sleep and help us fight infectionsThey add that infection-fighting antibodies(抗体)are reduced during periods when you dont get enough sleep

    A new study from the University of Washington in the USseems to confirm thisDrNathaniel Watson was the lead writer of the studyWatson says his study shows that the immune system works best when the body gets enough sleepFor the studyWatson and his team studied 11 pairs of twinsThis is an important difference from other sleep studiesOther research did not study twinsResearchers found that the twin who slept less had a weaker immune system

    Watson says his study showed for the first time that a long-term lack(缺乏)of sleep shuts down parts of the immune systemHe says parts that move white blood cells around the body are influencedWhite blood cells fight infections in the body

    Watsons study provides more evidence(证据)that sleep is important tooverall health”.And sleep is especially important to immune health

    The researchers published their findings in the magazine Sleep

    How much sleep is enough?

    To stay in good healthexperts at the Mayo Clinic say that adults should get 7 to 8 hours of sleepTeenagers need 9 to 10 hoursAnd school-aged children may need more than 10 hours of sleep a night

    Experts say our sleep becomes poor in our 30sBy the time we reach our 50sthe average person has lost 50 percent of their ability to have a restful sleepThese people also have trouble falling asleep and staying asleep through the nightFrom middle age onthey say these problems only get worseand they can influence our health

    Signs you may not be getting enough sleep

    Youre always hungry or youve gained weight

    You have trouble making decisions

    You have trouble remembering things

    Your skin doesnt look good

    You are having trouble seeing

    (   )1From the first three paragraphs we know that        

    A.it is a waste to spend about one-third of our lives asleep

    B.well become seriously ill if we dont have enough sleep

    C.enough sleep does good to infection-fighting antibodies

    D.immune system is protected when people begin to sleep

    (   )2From Watsons studywe know        

    A.enough sleep helps the immune system work well

    B.the study of twins is a kind of common sleep study

    C.twins need less sleep but have stronger immune system

    D.sleeping for a long time is important to immune health

    (   )3Which of the following is right according to the passage

    A.People dont need 7 to 8 hours of sleep a night in their fifties

    B.The less you sleep every nightthe more weight youll lose

    C.Teenagers should get more than 10 hours of sleep a night

    D.If your memory gets worseyou may not get enough sleep

    (   )4What will probably be written in the following part

    A.How to improve your sleep          BHow important enough sleep is!

    C.How amazing if you look good!      DHow to avoid trouble of seeing

    答案

    acooCO.net.cn组卷^
    1C 2A 3D 4A



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