D．those who can enjoy art

　　Ⅲ.阅读填空

　　阅读短文，根据所读内容在表中的空格处填上适当的单词或短语。注意：每空不超过3个单词。

　　All of us, at some point, experience nights where we have difficulty falling asleep or staying asleep. The National Institute of Health estimates that one in three adults have bits of mild sleeplessness or insomnia (失眠), while one in ten suffer from chronic (长期的) insomnia.

　　Sleeplessness can be caused by many different things. Most people experience sleeplessness for an outside stimulus (刺激) such as stress, improper diet or a poor sleeping environment. Once the stimulus passes, the ability to sleep will usually return. Chronic sleeplessness may be caused by ongoing health concerns such as the physical pain of arthritis (关节炎) or the emotional pain of anxiety and depression.

　　Those that suffer from sleepless nights may find themselves feeling sleepy or tired during the day. The ability to concentrate or focus on a task reduces and they are less mentally alert. Because the body needs sleep to support a healthy immune system, those who have little sleep may be more affected by both acute and chronic illnesses like high blood pressure and diabetes.

　　Sleeplessness not only has effects on your physical self but also your emotional well－being. Being unable to sleep well for a few nights may only produce anger. However, if sleeplessness becomes chronic, the price could be much higher in the form of anxiety, depression and possibly substance abuse. Those with chronic sleeplessness may turn to controlled substances like sleeping pills and alcohol to help them have a good night’s sleep.

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