Directions: For each blank in the following passage, there are four choices marked A, B,C and D. Choose the one that is most suitable.

     Insomnia, or “poor sleep”, can have bad effects on a person's health and general well-being. It canon both our physical and mental health and can lead to other health. 
     Insomnia can be traced to many different reasons, but what isto ninny sufferers is their inability to relax fully and “switch the mind”.
     Constant thoughts,around and around in the mind, moving from oneto the next, prevent stillness and peace anda sufferer extremely tired.
     In order to treat insomnia, it is first necessary to allow a sufferer to re-experiencereal relaxation feels like. It’s almost as though they've forgotten how to relax. Once this has beenby the brain, then fast and effectivecan be made to re-educate the unconscious towards allowing the person to relaxand to allow a natural state of sleep to.
     Hypnotherapy(催眠疗法) is one of the fastest and most effective ways ofthis goal for long-lasting results.
     Sleeping pills, if used at all, should only be a short-termas their effect is soon reduced and their side effects can be deep and far-reaching.