2. 考研
  3. Chronic insomnia is a major public health problem. And too many people are using 【B1】______ therapies, even while there are a fe

Chronic insomnia is a major public health problem. And too many people are using 【B1】______ therapies, even while there are a fe

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问题     Chronic insomnia is a major public health problem. And too many people are using 【B1】______ therapies, even while there are a few treatments that do work. Millions of Americans 【B2】______ awake at night counting sheep or have a stiff drink or 【B3】______ an pill, hoping it will make them sleepy. 【B4】______ experts agree all that self-medicating is a bad idea, and the causes of chronic insomnia remain【B5】______.
    Almost a third of adults have trouble sleeping, and about 10 percent have 【B6】______ of daytime impairment that signal true insomnia. But【B7】______the complaints, scientists know surprisingly little about what causes chronic insomnia, its health consequences and how best to treat it, a panel of specialists【B8】______together by the National Institutes of Health concluded Wednesday. The panel called 【B9】______ a broad range of research into insomnia,【B10】______that if scientists understood its【B11】______causes, they could develop better treatments.
    Most, but not all, insomnia is thought to【B12】______other health problems, from arthritis and depression to cardiovascular disease. The question often is whether the insomnia came first or was a result of the other diseases and how trouble sleeping in【B13】______complicates those other problems. Other diseases【B14】______, the risk of insomnia seems to increase with age and to be more【B15】______among women, especially after their 50s. Smoking, caffeine and numerous【B16】______drugs also affect sleep.
    The NIH is spending about $200 million this year on sleep-related research, some【B17】______to specific disorders and others【B18】______the underlying scientific laws that control the nervous system of sleep. The agency was【B19】______the pane’ s review before deciding what additional work should be【B20】______at insomnia.
【B1】
选项 A、unproven
B、unknown
C、improper
D、imperative
答案A
解析 考查形容词辨析。此空所在句子意为：太多人正使用______的治疗方法，尽管有些方法确实是有效的。根据句意，此处应选A．unproven“未经验证的”。unknown“未知的”；improper“不恰当的”；imperative“必要的，不可避免的”，均不符合题意。
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