第17题: [单项选择]{{B}}{{I}}Questionsll-14 are based on the following passage.{{/B}}{{/I}}What does not happen in the brain in the active sleep A. The brain becomes very active. B. The brain becomes very inactive. C. The brain temperature rises. D. The brain blood rises. 参考答案:B 答案解析:[听力原文] 11-14
Each night we alternate between two kinds of sleep: active sleep and passive sleep.