Chronic insomnia is a major public health problem. And too many people are using__1__ therapies，even while there are a few treatments that do work. Millions of Americans __2__awake at night counting sheep or have a stiff drink or __3__an pill，hoping it will make them sleepy.__4__ experts agree all that self-medicating is a bad idea，and the causes of chronic insomnia remain__5__. Almost a third of adults have trouble sleeping，and about 10 percent have__6__ of daytime impairment that signal true insomnia. But __7__the complaints，scientists know surprisingly little about what causes chronic insomnia，its health consequences and how best to treat it，a panel of specialists __8__together by the National Institutes of Health concluded Wednesday. The panel called__9__a broad range of research into insomnia，__10__that if scientists understood its __11__causes，they could develop better treatments. Most，but not all，insomnia is thought to __12__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__13__complicates those other problems. Other diseases __14__，the risk of insomnia seems to increase with age and to be more __15__among women，especially after their 50s. Smoking，caffeine and numerous __16__drugs also affect sleep. The NIH is spending about $200 million this year on sleep-related research，some__17__to specific disorders and others __18__the underlying scientific laws that control the nervous system of sleep. The agency was__19__the panel‘s review before deciding what additional work should be__20__ at insomnia.
D@!=d@V. SR DXfkoI 1. [A] unproven [B] unknown [C] improper [D] imperative
0_CN/5F MNSbtT*^ 2. [A] fall [B] lie [C] seem [D] become
0{#8',*}m? ,\qs4& 3. [A] prescribe [B] pop [C] abuse [D] experiment
E*jP8亚洲国产精品va在线观看麻豆
