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24题答案是（ ）
A、on
B、off
C、up
D、down
【正确答案】：B
【题目解析】：在给出的文本中，第24题考查的是介词的使用，具体是描述失眠者无法放松并“关闭心灵”的表达方式。在英语中，“switch off”是一个常见的表达，用来描述关闭电器、灯或某种功能，而在这里则用来形象地表达“关闭心灵”，即让心灵不再被纷乱的思绪所占据。 选项A的“on”通常表示开启或处于某种状态，与文本中描述的“无法放松”和“关闭心灵”的意思不符。 选项B的“off”符合“关闭”的语境，与“switch”搭配使用时，可以表示关闭或停止某种状态或功能。 选项C的“up”通常与“switch”搭配使用时，表示开启或提升某种状态，与文本中的意思不符。 选项D的“down”虽然有时也与“switch”搭配使用，但通常表示降低或减弱某种状态，而不是关闭。 因此，根据文本的语境和选项的意思，第24题的正确答案是B，即“off”。