【单选题】Insomnia can be traced to many different reasons, but what is_____(23)to many sufferers is their inability to relax fully and 'switch the mind_____(24)'.
【判断题】Insomnia can be one example of the physical symptoms of culture shock .
【单选题】The sufferer of insomnia can relax themselves before sleeping in the following ways EXCEPT ______.
C.
changing sleeping habits
【单选题】Which type of insomnia is regarded as the cause of jet lag?
【简答题】抽样的类型主要分为( )和( )两大类。
【判断题】概率抽样法的类型主要有任意抽样、判断抽样、配额抽样。
【单选题】Which type of insomnia is regarded as the most serious?
【判断题】含湿量 d 是指每千克空气所含有水蒸气的重量。( X )