考研易错题（2019/10/10）

第1题： 现场试验研究具有下列哪项其他观察性研究不具备的特点 A．将研究对象分为病例组和对照组 B．是一种“由因到果”的研究 C．可能产生的主要偏倚是应答率过低 D．调查资料计算OR值 E．对研究组给予某种干预措施

【单选题】： A     B     C     D     E

第2题：对非ST段抬高的急性冠状动脉综合征患者的下列治疗措施中，哪项是不恰当的 A．低分子肝素加阿司匹林 B．普通肝素加阿司匹林 C．抗缺血治疗 D．溶栓治疗

【单选题】： A     B     C     D

第3题：Women often (1) that dating is like a cattle (2) , and a paper just published inBiology Letters by Thomas Pollet andDaniel Nettle of Newcastle University, inEngland, suggests they are (3) . They have little cause for complaint, however, because the paper also suggests that in this particular market, it is (4) who are the buyers. Mr. Pollet andDr. Nettle were looking for (5) to support the contention that women choose men of (6) status and resources, as well as good looks. That may sound common sense, but it was often (7) by social scientists until a group of researchers who called themselves evolutionary psychologists started investigating the matter two decades ago. Since then, a series of experiments in laboratories have supported the contention.But as all zoologists know, (8) can only tell you so much.Eventually, you have to look at (9) populations. And that is what Mr. Pollet andDr. Nettle have done. They have examined data from the 19t0 census of the United States ofAmerica and discovered that marriage is, indeed, a market. Moreover, as in any market, a (10) of buyers means the sellers have to have particularly attractive goods on (11) if they are to make the exchange. The advantage of picking 1910 was thatAmerica had not yet settled down, demographically speaking. Though the long-colonized eastern states had a sex (12) of one man to one woman, or thereabouts, in the rest of the country the old adage "go west, young man" had resulted in a (13) of males. Mr. Pollet andDr Nettle were thus able to see just how picky women are, (14) the chance. (15) looking at the whole census, the two researchers relied on a sample of one person in 250. They then (16) the men in the sample a socioeconomic status score between zero and 96, on a scale drawn up in 1950 (which was as close to 1910 as they could get). They showed that in states where the sexes were equal in number, 56% of low status men were married by the age of 30, (17) 60% of high status men were.Even in this case, then, there are women who would prefer to remain (18) rather than marry a deadbeat. When there were 110 men for every 100 women (as, for example, inArizona), the women got really (19) . In that case only 24% of low-status men were married by 30 compared with 46% of high-status men.As the men went west, then, so did their (20) opportunities. A．serious B．choosy C．tolerant D．casual

【单选题】： A     B     C     D

第4题： Psychologists______ A．believe that television causes juvenile delinquency B．think that television programmes are harmless C．cannot find much evidence of a direct connection between television and juvenile delinquency D．believe that television has a harmful effect on children

【单选题】： A     B     C     D

第5题：有一个文件系统如图5.4所示。图中的框表示目录，圈表示普通文件。根目录常驻内存，目录文件组织成链接文件，不设文件控制块，普通文件组织成索引文件。目录表目指示下一级文件名及其磁盘地址(各占2个字节，共4个字节)。若下级文件是目录文件，指示其第一个磁盘块地址。若下级文件是普通文件，指示其文件控制块的磁盘地址。每个目录文件磁盘块后4个字节供拉链使用。下级文件在上级目录文件中的次序在图中为从左至右。每个磁盘块有512字节，与普通文件的一页等长。 普通文件的文件控制块组织结构如图5.5所示，其中每个磁盘地址占2个字节，前10个地址直接指示该文件前10页的地址。第11个地址指示一级索引表地址，一级索引表中每个磁盘地址指示一个文件页地址；第12个地址指示二级索引表地址，二级索引表中每个地址指示一个一级索引表地址；第13个地址指示三级索引表地址，三级索引表中每个地址指示一个二级索引表地址。 问： (1)一个普通文件最多可有多少个文件页 (2)若要读文件J中的某一页，最多启动磁盘多少次 (3)若要读文件W中的某一页，最少启动磁盘多少次 (4)就(3)而言，为最大限度减少启动磁盘的次数，可采用什么方法 此时，磁盘最多启动多少次

【分析题】：