Insomnia,or"poor sleep",can have bad effects on a person′s healt

Insomnia,or"poor sleep",can have bad effects on a person′s health and general well-being.It can?21onboth our physical and mental health and can lead to other health22 Insomnia can be traced to many different reasons,but what is?23to ninny sufferers is their inability to relax fully and"switch the mind?24Constantthoughts,25?around and around in the mind,moving from one?26?tothe next,prevent stillness and peace and?27?a sufferer extremely tired. In order to treat insomnia?28,it isfirst necessary to allow a sufferer tore-experience?29?real relaxation feel like.It’s almost as though they′ve forgotten how to relax.Once this hasbeen?30?by the brain,then fast and effective?31?can be made to reeducatethe unconscious towards allowing the person to relax?32?and to allow anatural state of sleep to33 Hypnotherapy(催眠疗法)is one of the fastest and most effective ways of?34?this goalfor long-lasting results. Sleeping pills,if used at all,shouldonly be a short-term35as their effect is soon reduced and their side effectscan be deep and far-reaching. 第21题答案是（ ）
A、harm
B、affect
C、change
D、impact
【正确答案】：D