2. 外语
  3. You know you need to eat nutritious foods, exercise and even play safe to stay physically healthy. But, sleep for physical【B1】__

You know you need to eat nutritious foods, exercise and even play safe to stay physically healthy. But, sleep for physical【B1】__

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问题     You know you need to eat nutritious foods, exercise and even play safe to stay physically healthy. But, sleep for physical【B1】______How can that be an essential part of physical fitness?
    Sleep is【B2】______important for your health and safety. You need to get enough sleep as well in order for your brain to work【B3】______. Did you know that sixty percent of adults in our country have sleep problems? That’s definitely not an【B4】______statistic.     Have you ever heard of the term sleep deprivation? That term means lack of sleep. If sleep deprivation occurs for a lengthy time, many【B5】______things may happen. Sleep deprivation can make life seem more【B6】______and therefore makes it more difficult for the person to deal on a day-to-day basis. Sleep deprivation increases the【B7】______that a person will get sick be cause it【B8】______the body’s ability to fight infections. Finally,【B9】______So how much sleep is enough? Well, it depends on the person.【B10】______The average teenager needs a little more than 9 hours. Changes in a teenager’s body are tile reason for this. Their body clock is delayed during this time of great change and they naturally want to go to sleep later at night and therefore wake up later.【B11】______, so they need to work on gradually adjusting their sleeping patterns.
【B5】
选项
答案negative
解析 形容词，空格所在句主要表达长期睡眠缺乏会导致什么结果，下文具体阐述那些结果，这些结果很显然是消极的，negative表示“消极的，负的”，恰好符合题意。
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