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.

　　1、A.unproven　　B.unknown　　C.improper　　D.imperative

　　2、A.fall　　B.lie　　C.seem　　D.become

　　3、A.prescribe　　B.pop　　C.abuse　　D.experiment

　　4、A.And　　B.Though　　C.Thus　　D.But

　　5、A.peculiar　　B.anonymous　　C.mysterious　　D.unexpected

　　6、A.signals　　B.symptoms　　C.signs　　D.symbols

　　7、A.in addition to　　B.except for　　C.owing to　　D.for all

　　8、A.pulled　　B.collected　　C.brought　　D.drawn

　　9、A.on　　B.for　　C.up　　D.in

　　10、A.noting　　B.notifying　　C.nosing　　D.nominating

　　11、A.undertaking　　B.underlining　　C.underlying　　D.undermining

　　12、A.cause　　B.accompany　　C.follow　　D.attend

　　13、A.short　　B.case　　C.essence　　D.turn

　　14、A.inside　　B.outside　　C.aside　　D.besides

　　15、A.common　　B.popular　　C.frequent　　D.regular

　　16、A.conscription　　B.description　　C.subscription　　D.prescription

　　17、A.aimed　　B.targeted　　C.designated　　D.designed

　　18、A.examining　　B.inspecting　　C.verifying　　D.assessing

　　19、A.conducting　　B.awaiting　　C.receiving　　D.considering

　　20、A.assigned　　B.charged　　C.directed　　D.attended

　參考答案：

　　1、A　2、B　3、B　4、D　5、C　6、B　7、D　8、C　9、B　10、A

　　11、C　12、B　13、D　14、C　15、A　16、D　17、B　18、A　19、B　20、C