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29题答案是（ ）
A、if
B、how
C、where
D、what
【正确答案】：D
【题目解析】：在第29题中，句子结构是“allow a sufferer to re-experience ____ real relaxation feels like”，其中“____ real relaxation feels like”是宾语从句，作为“re-experience”的宾语。这个宾语从句缺少主语，需要用一个能够引导宾语从句并作为主语的连接词。 选项A "if"通常用于引导条件状语从句，表示“如果”的意思，不适合用作宾语从句的连接词。 选项B "how"用于引导方式状语从句或宾语从句，表示“如何”的意思，但在这个上下文中，我们需要一个能作为主语的词，而不是一个副词。 选项C "where"用于引导地点状语从句或宾语从句，表示“在哪里”的意思，同样不适合作为宾语从句的主语。 选项D "what"可以引导宾语从句，并在从句中作主语、宾语或表语。在这里，“what”引导宾语从句，并在从句中作主语，指代“真正的放松感觉是什么样的”，符合句子结构和意义。 因此，正确答案是D。这个选项使句子意思完整，逻辑清晰，即“让失眠者重新体验真正的放松感觉是什么样的”。