| How much sleep does a person need
(31) the physiological bases of the need for sleep remain
conjectural (猜想), rendering conclusive answers to this question impossible, much
evidence has been gathered on how much sleep people do in fact obtain. Perhaps
the most important conclusion to be (32) from this evidence
is (33) there is great variability among individuals in total
sleep time. For adults, (34) between six and nine hours of
sleep as a nightly average is not unusual, and 7.5 hours probably best expresses
the norm. Such norms, of course, forms inevitably vary with the criteria of
sleep employed. The most (35) and reliable figures on sleep
time, including those cited here, come from studies in sleep laboratories, where
EEG criteria are employed. (36) consistently has been associated with the varying A. unless B. however C. although D. even if [不定项选择题]受传者在知识、情感、态度行为等方面的变化是（ ）。
A.传者 B.受传者 C.信息 D.讯息 E.传播效果 [判断题]一种焊接方法只有一条电弧静特性曲线。( )
A.正确 B.错误 [填空题]在显示手信号时，凡昼间持有手信号旗的人员，应将信号旗( )。J443
[单项选择]药物预防性治疗的治疗对象包括（）
A. HIV感染者 B. 与新结核病人密切接触者 C. 胸片有既往结核征象者和新近阳转者 D. 来自高流行区的移民 E. 以上均是 [多选题]开展电梯救援时应在专业人员指导下进行，在（）情况方可开启对应电梯层门，开启时保持重心稳定，必要时采取安全绳保护，严防跌落电梯井。
A. 确认轿厢楼层 B. 确认电源切断 C. 确认被困人员生还 D.确认被困人员位置 [单项选择]No one likes bad news, but for some people, no news is worse. People who are mildly neurotic are stressed by uncertainty even more than by bad news, a new study finds. Psychologists have long known that bad news grabs attention, making its recipients take notice, while good news often is given short effect in the brain. Scientists have explained the phenomenon as a survival mechanism of the brain.
But researchers at the University of Toronto wanted to learn more about how people respond to uncertainty--a lack of information or information that isn’t well understood. Forty-one young men and women took a test designed to assess how neurotic they were, then were fitted with electrode(电极 ) caps that measured brain activity as they completed certain tasks. As a way of monitoring stress, the investigators tracked neural activity in the anterior cingulate cortex(前扣带皮层), a part of the brain involved in conflict, uncertainty and monitoring errors. The participants later were asked A. the participants should respond immediately after the plus or minus signs B. a plus sign probably means the lack of improvement of the participant C. participant with more plus marks has more responses on questionable news D. a question mark probably means the text is failed [单项选择]为了审查应收票据的贴现，无效的审计程序是( )。
A. 向被审计单位的开户银行函证 B. 审查被审单位的相关会议记录 C. 向被审计单位的债务单位函证 D. 询问被审计单位管理当局 [单项选择]安全生产投入是保障安全生产的重要基础。作为生产经营单位保证安全生产投入的是（）。
A. 单位主要负责人 B. 财务部门 C. 安全部门 [单选题]建筑地面工程施工中，整体面层施工后，养护时间不应小于（ ）d。
A.7 B.14 C.21 D.28 我来回答: 提交
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