2. 外语
  3. The author thinks sleep is a funny thing as it is necessary for human life. While awake, people can produce ______ waves in the

The author thinks sleep is a funny thing as it is necessary for human life. While awake, people can produce ______ waves in the

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问题 The author thinks sleep is a funny thing as it is necessary for human life.
While awake, people can produce ______ waves in their brains.
选项
答案alpha or beta
解析 第3个小标题Sleep and the Brain部分的第1段第2、3句：A waking and relaxed person generates alpha waves，which are consistent vibrations at about 10 cycles per second．An alert person generates beta waves，which are about twice as fast．空白处需要waves的修饰成分。原文中的waking and relaxed和alert是awake的两个方面，故醒着时所产生的脑电波是alpha波或beta波。
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大学英语六级

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