电动机断相是指三相交流电动机的（）绕组断线。A．1相 B．2相 C．3相

Sleep is a basic necessity of life and it is as important to our health as air, food and water. When we sleep well, we wake up feeling energetic, alert and ready to face daily challenges. When we don’t every part of our lives can suffer.
A survey made by the 2002 National Sleep Foundation (NSF) in America found that 74 percent of American adults are experiencing a sleep problem a few nights a week or more and 39 percent get less than 7 hours of sleep each night and want to have a sleep during the day.
Getting enough continuous quality sleep influences how we feel and perform next day. Getting enough sleep refers to the amount of sleep you need not to feel tired next day. Although sleep experts generally recommend an average of 7-9 hours each night, some people can get along with less while others need as many as ten hours to feel energetic next day. Sleep requirements vary(变化)over the life cycle. Newborns and babies need a lot of sleep and have several periods of sleep throughout a 24-hour time period. Teenagers’ sleep patterns turn to a later sleep-wake cycle, but they still need around 9 hours of sleep. Throughout adulthood, even as we get older, we need 7-9 hours of sleep. Sleep patterns may change, but the need for sleep remains the same.
According to the 2002 poll. Over 80 percent of American adults believe that not getting enough sleep leads to poor performance at work, risk of injury, poor health and difficulty getting along with others. Often, people become easily annoyed due to lack of sleep. Recent research suggests that lack of sleep also leads to approximately 100,00 sleep-related traffic accidents each year and results in 1,500 deaths.
If you are having sleep problems, turn to a sleep diary published by the National Sleep Foundation. A sleep diary helps you examine some of your health and sleep habits so that you and your doctor can find some reasons for poor sleep. Establishing a regular bed and wake-up schedule may also help you sleep well. Besides, talking to your doctor or a sleep specialist is of great help. Most sleep disorders can be successfully treated once properly diagnosed(诊断).

Title	Let sleep work for you
Theme	Like air, food and water, sleep is of great小题1:      to our health.
The小题2:     of the 2002 NSF survey	●74% of American adults have sleep problems. ●39% of American adults sleep for less than seven hours each night and feel小题3:     during the daytime.
The小题4:     of sleep	●Sleep experts recommend that adults should sleep for 7-9 hours each night on小题5:     . ●At different periods of one’s life cycle, different patterns of sleep are 小题6:  .
小题7:    caused by lack of sleep	●It has a bad 小题8:     on one’s job performance, health and social relationships with others. ●If people don’t get enough sleep, it is小题9:     for them to become annoyed. ●It can cause traffic accidents or even death.
The treatment For sleep problems	●Use a sleep diary to examine your health and sleep habits. ●Go to bed and wake up in the morning小题10:    every day. ●If necessary, your doctor or a sleep specialist will be a great help to your sleep disorders.