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含有β-内酰胺环的药物有（）
A.克拉维酸
B.氨曲南
C.头孢哌酮
D.新霉素
E.克拉霉素
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High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don’t score as well on memory tests as their peers with lower levels of the stress hormone. What’s more, high levels of cortisol are also associated with shrinking of the hippocampus, a region of the brain that plays a key role in learning and memory. The findings suggest that even cortisol levels in the normal, 'healthy' range can actually accelerate brain aging. The study results 'now provide substantial evidence that long-term exposure to adrenal stress hormones may promote hippocampal aging in normal elderly humans,' write Nada Porter and Philip Land- field of the University of Kentucky in Lexington in their editorial. Cortisol is a hormone released in response to stress by the adrenal glands ,which sit on top of the kidneys. Over a 5 to 6-year period ,Dr. Sonia Lupien and his colleagues measured 24-hour cortisol levels in 51 healthy volunteers ,most of whom were in their 70s. Despite wide variation in cortisol levels, the participants could be divided into three subgroups, those whose cortisol progressively increased over time and was currently high (increasing/high); those whose cortisol progressively increased over time and was currently moderate (increasing/moderate); and subjects whose cortisol decreased, but was currently moderate (decreasing/moderate). The researchers tested the volunteers' memory on six people in the increasing/high category and five people in the decreasing/moderate group. The groups did not differ on tests of immediate memory, but the increasing/high cortisol group had other memory problems compared with those in the decreasing/moderate group. The researchers also found that the total, volume of the hippocampus in those in the increasing/high group was 14 % lower than those in the decreasing/moderate group, although there were no differences in other brain regions. The results suggest that '... brain aging can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within, this normal range is related to variation in the rate of brain aging,' write Porter and Landfield. 'This further, suggests that chronic stress may accelerate the worsening of hippocampus. '31. The part of the brain important for a person's learning, and memory isA．the cortisol.B．the adrenal glands.C．the stress hormones.D．the hippocampus.
A.B.C.D.E.F.G.H...I.theJ.B．theK.C．theL.D．theM.
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Nokia-SAP Mobile Sales Online Sales teams need to maximize their time with customers in order t...What access does Nokia-SAP Mobile Sales Online provide Sales teamsIt provides them the access to their teams’（）and customer information.
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What are the characteristics of the Eugene O'Neill's plays?
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下述不符合急性肾炎病理改变特征的是（）
A . A.肾小球上皮侧驼峰样沉积物
B . B.弥漫内皮系膜细胞增生性病变
C . C.IgG沉积
D . D.多形成新月体
E . E.可见白细胞渗出
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虚拟局域网指的是（）
A.VLAN
B.VVT
C.VTP
D.VDS
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下面几种作业中，有可能导致井控险情的施工包括（）。
A.发生溢流不及时关井
B.在油气层井段长时间活动钻具
C.天然气井长时间静止，不循环钻井液
D.发生井漏后提钻未吊灌钻井液
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在下列各项中，不属于实物黄金投资优势的是（）。
A.有效抵御通货膨胀 B.对冲投资风险，实现投资组合保值、增值 C.兼具收藏和投资功能，还可做馈赠之用 D.委托银行代保管，安全放心
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头部创伤后，立即出现枕部皮下淤血，提示
A.枕部挫伤
B．颅后窝骨折
C．颅中窝骨折
D．颅前窝骨折
E．硬脑膜外血肿
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世界卫生组织和《中国居民膳食营养素参考摄入量》都建议饱和脂肪酸的摄入量应低于膳食总能量的？（）
A.15%
B.10%
C.25%
D.5%
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能影响血清抗体效价的主要因素有
A . A．年龄
B . B．体重
C . C．体质
D . D．有无进食
E . E．抗性药物的使用
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关于钩虫下列哪项是错误的？（）
A.钩虫卵为无色透明，壳薄而透明B.十二指肠钩虫交合丝末端合并形成倒钩C.我国南方以美洲钩虫为主D.幼虫会引起钩蚴性皮炎E.钩虫吸血时其头腺可分泌抗凝血素故伤口不易凝血
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对不住院的肺结核病人进行社区护理主要目的是（）
A.帮助病人与防痨机构沟通
B.供给病人有关结核病的知识
C.评估病员居住的环境
D.给予病人情感的支持
E.观察病人的病情
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包装材料的性能会直接影响包装质量，它主要涉及（）。
A . 吸湿性能
B . 物理性能
C . 化学性能
D . 力学性能
E . 加工工艺性能
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