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The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday.While elderly people (1) to sleep for fewer hours than they did when they were younger, this has a(n) (2) effect on their brain’s performance and they would benefit from getting more, according to research.Sean Drummond, a psychiatrist (心理医生) at the University of California, San Diego, said that older people are more likely to suffer from broken sleep, while younger people are better at sleeping (3) straight through the night.More sleep in old age, however, is (4) with better health, and most older people would feel better and more (5) if they slept for longer periods, he said."The ability to sleep in one chunk (整块时间) overnight goes down as we age but the amount of sleep we need to (6) well does not change," Dr Drummond told the American Association for the Advancement of Science conference in San Diego."It’s (7) a myth that older people need less sleep. The more healthy an older adult is, the more they sleep like they did when they were (8) . Our data suggests that older adults would benefit from (9) to get as much sleep as they did in their 30s. That’s (10) from person to person, but the amount of sleep we had at 35 is probably the same amount as we need at 75."A．alertB．associateC．attractingD．clingE．continuingF．definitelyG．differentH．efficientlyI．formallyJ．functionK．mixedL．negativeM．sufficientN．tendO．younger （1）处应填（）
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数据库系统的主要特点为数据集成性、数据的高______和低冗余性、数据独立性，以及数据统一管理和控制。
在C盘当前文件夹下有一个已建立好的顺序文件Alph.txt，文件内容为只含有字母的一个字符串(有双引号界定符)。单击窗体，打开Alph.txt文件，读取字符串并显示在文本框Text1中，然后调用StrSort过程将此字符串按ASCII码的顺序重新排列并显示在文本框Text2中，最后将重新排列的字符串存入Alp().txt文件中(无双引号界定符)。请选择横线处合适的语句( )。 Private Sub Form Load() Dim Strln As String, StrOut AS String Open "C: \Alph.txt" For Input As#1 ______ Close Text1.Text=StrIn ______ Text2.Text=StrOut Open "C: \AIpO.txt" For Output As#2 ______ Close Fnd Sub Private Function StrSort(s As String)As String Dim sArr()As String *1, j As Integer, J As Integer, n As Integer DimtAS String*1 n=Len(s) ReDim sArr(n) For i=1 To n sArr(i)=Mid(s，i，1) Next i For i=1 To n. 1 For j=i+1 To n If sArr(i)＞sArrj Then t=sArr(i):sArr(i)=sArr(i):sArr(j)=t EndIf Next i, i For i=1 To n StrSort=StrSort＆sArr(i) Nexti End Function
So many people use the cell phones so frequently every day. But (1) little is certain about the health effects of its use. Manufacturers (2) that cell phones meet government standards for safe radio-frequency radiation emission, but enough studies are beginning to document a possible (3) in rare brain tumors (肿瘤), headaches and behavioral disorders in children to cause concern. So far, the evidence isn’t (4) on whether the use of cell phones (5) to any increased risk of cancer. In a new trial, researchers asked 47 volunteers to (6) in a project to measure glucose (葡萄糖) consumption in the brain by scanning the brain to see how cells use energy. For both 50-minute scans, the volunteers had a cell phone (7) to each ear. During the first scan, the devices were turned off, but for the second scan, the phone on the right ear was (8) on and received a recorded-message call, although the volume was muted (消音) so the noise wouldn’t bias the results. The results of the second scan showed that the (9) of the brain nearest to the device had higher rates of glucose consumption than the rest of the brain. The study shows that cell phones can change brain activity, and (10) a whole new avenue for scientific inquiry, though it doesn’t say anything about whether cell-phone radiation can cause cancer.A．conclusiveB．contributesC．deriveD．expressesE．fixedF．immenselyG．increaseH．maintainI．missionJ．participateK．particularL．providesM．regionsN．surprisinglyO．switched （2）处应填（）
Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, everyone knows how to do it and it carries the (1) risk of injury. The human body is designed to walk. You can walk in parks or along a river or in your neighborhood. To get (2) benefit from walking, aim for 45 minutes a day, an average of five days a week.Strength training is another important (3) of physical activity. Its purpose is to build and (4) bone and muscle mass, both of which shrink with age. In general, you will want to do strength training two or three days a week, (5) recovery days between sessions.Finally, flexibility and balance training are (6) important as the body ages. Aches and pains are high on the list of complaints in old age. The result of constant muscle tension and stiffness of joints, many of them are (7) , and simple flexibility training can (8) these by making muscles stronger and keeping joints lubricated (润滑). Some of this you do whenever you stretch. If you watch dogs and cats, you’ll get an idea of how natural it is. The general (9) is simple: whenever the body has been in one position for a while, it is good to (10) stretch it in an opposite position.A．allowingB．avoidableC．brieflyD．componentE．determinedF．helpingG．increasinglyH．lowestI．maintainJ．maximumK．preventL．principleM．provokeN．seriouslyO．topic （2）处应填（）
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