【名词&注释】
毛泽东(mao tse-tung)、相容性(compatibility)、排他性(exclusiveness)、三中全会、重要讲话(important speech)、党在过渡时期的总路线、《关于正确处理人民内部矛盾的问题》(on the correct handling of contradictio ...)
[单选题]1950年6月毛泽东在七届三中全会上作的重要讲话是
A. 《不要四面出击》
B. 《关于党在过渡时期的总路线》
C. 《关于正确处理人民内部矛盾的问题》(on the correct handling of contradictio)
D. 《论十大关系》
根据以下内容,回答下面的题目。Researchers have found that REM (rapid eye movement) sleep is important to human beings.This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence.The deeper a person’s sleep becomes, the longer the periods of rapid eye movement.There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep.Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.Accompanying these physical changes in the body is a very important characteristic of REM sleep.It is during REM sleep that a person dreams.According to the passage, how often does REM sleep occur in one night?