2. 外语
  3. Nightmare disorder, which is also called dream disorder, is【B1】______ by the occurrence of repeated dreams during which the slee

Nightmare disorder, which is also called dream disorder, is【B1】______ by the occurrence of repeated dreams during which the slee

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问题     Nightmare disorder, which is also called dream disorder, is【B1】______ by the occurrence of repeated dreams during which the sleeper feels【B2】______ and frightened.
    Nightmares are dreams that cause intense fear. During the dream, the sleeper usually【B3】______ or experiences a threat to their life or safety. Nightmares are also reported that do not involve【B4】______ danger. As the dream progresses, the threat to the person usually increases, as does their sense of fear. Waking usually occurs just as that threat or danger reaches its【B5】______ .
    The person wakes from the nightmare with a【B6】______ sense of fear. Waking is complete, and usually  【B7】______ by increased heart rate, sweating, and other symptoms of 【B8】______ or fear. Once fully awake, 【B9】___________________ . Because clarity is achieved immediately upon waking, returning to sleep after a nightmare is often difficult.
    【B10】________________________ . In addition, people may have problems falling asleep if they are experiencing tension caused by the fear of having nightmares. As a result, these people may have the signs and symptoms associated with mild sleep deprivation.
    The causes of nightmares are not known for certain.【B11】______________________ About half of these people are thought to suffer from psychiatric disorders that cause the nightmares.
【B11】
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答案Adults who have nightmares on a regular basis are a small minority of the American population
解析 本句较短，但包含定语从句。
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