2. 外语
  3. Sleep is crucial for good health. It helps memory and【B1】______, keeps you fit, strengthens your immune system, fights inflammat

Sleep is crucial for good health. It helps memory and【B1】______, keeps you fit, strengthens your immune system, fights inflammat

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问题     Sleep is crucial for good health. It helps memory and【B1】______, keeps you fit, strengthens your immune system, fights inflammation and keeps your heart and blood【B2】______in tip-top shape.
    While you’re snoozing, the body repairs damaged【B3】______, produces crucial hormones and strengthens memories—a process called consolidation, which helps you perform a new skill better after sleeping than you would if you spent an【B4】______amount of time awake. It’s a way for the body to【B5】______everything that happened over the past waking day and to kind of prepare for the next day.
    Short sleepers, typically【B6】______people who get less than sixhours of sleep at night, as well as people who don’t spend enough time in the deepest stages of sleep, are at higher risk of heart attacks and strokes than those who get at least seven hours.
    It’s not clear why sleep may affect the heart, or if there is some【B7】______factor that affects your cardiovascular system and ability to sleep. But one nighttime problem is a known heart【B8】______—sleep apnea(睡眠呼吸暂停). People who have this problem tend to snore and have upper airway collapse during sleep. This causes them to snort and gasp for breath, without really waking up enough to【B9】______it.
    If you’re not feeling rested during the day and your bed partner says you snore, you should ask your doctor about sleep apnea. There’s enough evidence out there suggesting that it is bad and people need to【B10】______
【B7】
选项
答案unidentified
解析 修饰关系题。分析句子结构可知此处应填入形容词。根据上下文可知，睡眠影响心脏的原因尚不清楚，而影响心脏系统和睡眠能力的因素我们也无从得知。结合录音，填入unidentified。
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大学英语四级

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