填空题

While awake, people can produce ______ waves in their brains.

【参考答案】

alpha or beta

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调查显示80%的大学生拥有手机 2．你认为大学生需要手机吗 3．你的理由 Is It Necessary for a College Student to Own a Mobile Phone

填空题

While sleeping, people might turn and toss if they are physically or mentally ill.