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【单选题】
Sound Effects Snorers(打鼾的人) have always been made jokes. In cartoons,their nasal roar 1ifts the roof off houses. In situation comedies,there's the wife who rolls her eves at her snoring bedmate. But in reality,it's not all that funny. In fact,snoring can be a nightmare for snorers and their troubled partners. who may wake up several times a night to poke,and maybe hoist loved ones onto their sides for a 1ittle relief. Risks of Snoring Problems But the nightly racket is more than a potential relationship strain. According to the latest research, an increasingly older and heavier population may make this condition an even greater health risk than we previously thought. For Maggie Moss-Tucker. successful treatment for a longtime snoring problem came almost by accident. One fall morning in 2005,she saw a sign at her local gym seeking snorers as volunteers for a study at Boston's Brigham &Women's Hospital. Moss-Tucker, now 56, was intrigued. She had started snoring nearly a decade earlier. “I'd tried everything to stop. ”she says. from sleeping upright to using nose strips or a mouth guard. But to her and her husband's dismay. nothing worked. When she signed up for the study and spent a night at a suburban Boston sleep lab, she found out why. After reviewing her sleep patterns and oxygen levels, researchers told her that her snoring was actually an indication of something worse. She suffered from a sleep apnea(呼吸暂停),a condition in which patients stop breathing repeatedly as they sleep and can wake up as many as 100 times a night—often without remembering it. That kind of revelation has led to doctors re-evaluating a condition once treated as little more than a nuisance. “In the past. snoring has been treated like a joking matter:you never talked about it with your doctor,”says Dr. David Rapoport, medical director of the Sleep Disorders Center at New York University Medical Center (NYC. . “But when it becomes very prominent or such that it wakes you up OF interferes with brea-thing,it can be a problem. ” Sleep apnea,in which the airway becomes blocked of. 1ess often. the brain fails to properly control breathing during sleeping. can be viewed as one extreme of the snoring spectrum. Soft snoring. which is not generally considered a health hazard. would be at the other end. As the sound and persistence of a patient's snoring grows,so do the health concerns. A study published in the March I issue of the journal Sleep found that loud snorers had a 40 percent greater risk than non-snorers of suffering from high blood pressure, 34 percent greater odds of having a heart attack and a 67 percent greater chance of having a stroke. That's a problem given the number of noisy sleepers out there. In a recent poll by the National Sleep Foundation, about one third of US working adults reported snoring at least a few nights in the previous month. Snoring generally worsens with age so the rate is even higher among the elderly. And,contrary to common perceptions,it's nearly as common in women as men. Menopause(更年期) appears to be a factor,as is weight. Being overweight can cause thickness in the airway tube, holding back the flow of oxygen. Treatment of Snoring Problems Yet many who regularly snore don't realize that it could be bad for their health. The research linking hypertension, cardiac problems and loud snoring is relatively new. And though awareness of sleep apnea is growing, specialists say the condition is still vastly undertreated. Primary-care physicians don't routinely ask patients about the quality of their sleep—though that is beginning to change and few patients think to tell their doctors that they're snoring, unless it becomes hazardous to their partner. Sleep specialists estimate that between 12 million and 18 million Americans have some form. of sleep apnea but many of them, like Moss-Tucker,remain undiagnosed for years. Re
A.
the causes of snoring problems
B.
the treatments of snoring problems
C.
the risks of snoring problems
D.
the hazards and the treatments of snoring problems
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【单选题】关于别构调节的叙述,正确的是
A.
所有别构酶都有一个调节亚基和一个催化亚基
B.
别构酶与别构效应剂的结合存在协同效应
C.
磺胺药通过别构抑制发挥作用
D.
别构激活和酶被激活剂激活的机制相同
【单选题】女 45 岁,排便疼痛伴鲜红色血便 3 天,出血最可能来自
A.
B.
直肠
C.
空肠
D.
十二指肠
E.
食管
【判断题】腐蚀就是金属的锈蚀
A.
正确
B.
错误
【单选题】异方差性将导致的后果,下列判断错误的是:
A.
普通最小二乘法估计量有偏和非一致
B.
普通最小二乘法估计量非有效
C.
普通最小二乘法估计量的方差的估计量有偏
D.
建立在普通最小二乘法估计基础上的假设检验失效
E.
建立在普通最小二乘法估计基础上的预测区间变宽
【单选题】关于别构调节的叙述,正确的是
A.
反应的产物不能充当别构效应剂
B.
别构效应与酶的四级结构无关
C.
别构酶常常是寡聚酶
D.
作用快,具有放大效应
【单选题】站台门应急门在( )情况下使用。
A.
站台门破裂时
B.
紧急情况下,列车进站停稳,车门未对准滑动门
C.
列车到站后3秒,滑动门未打开
D.
任何情况下
【单选题】该设备的到岸价为( )万元。
A.
1208
B.
1288
C.
1280
D.
1188
【单选题】女45岁排便疼痛伴鲜红色血便3天出血最可能来自
A.
B.
直肠
C.
空肠
D.
降结肠
E.
十二指肠
【单选题】贝利个人生涯的进球数为多少个?
A.
1381
B.
1188
C.
1288
D.
1281
【单选题】关于别构调节的叙述,正确的是
A.
所有别构酶都有一个调节亚基和一个催化亚基
B.
别构酶与别构效应剂的结合存在协同效应
C.
别构激活和酶被激活剂激活的机制相同
D.
磺胺药通过别构抑制发挥作用
E.
是体内快速调节酶含量的重要方式
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