考研每日一练（2019/5/25）

第1题：设三阶矩阵A的特征值为λ1=-1，λ2=2，λ3=4，对应的特征向量为ξ1，ξ2，ξ3，令P=(-3ξ2，2ξ1，5ξ3)，则P-1A*+2E、P等于( ) [*]

【单选题】： A     B     C     D

第2题：氨茶碱治疗支气管哮喘的作用机理是 A．阻断迷走神经 B．抑制磷酸二酯酶 C．激活腺苷酸环化酶 D．保护肥大细胞溶酶体膜 E．使封闭抗体增加

【单选题】： A     B     C     D     E

第3题： DNA复制起始过程，下列酶和蛋白质的作用次序是：①DDDPⅢ；②SSB；③引物酶；④解螺旋酶 A．①，②，③，④ B．④，②，③，① C．③，①，②，④ D．①，④，③，②

【单选题】： A     B     C     D

第4题：患者烦渴多饮较甚，口干舌燥，小便频数，尿量较多，舌苔薄黄，脉洪数无力，治疗宜选 A．消渴方 B．二阴煎 C．清肺饮 D．二冬汤 E．白虎汤

【单选题】： A     B     C     D     E

第5题：在总体标准差的区间估计中，抽样分布样本容量n＞30时，在置信度为1-a时，标准差的置信区间是()

【单选题】： A     B     C     D

第6题：生产价格与平均利润的关系是 A．首先形成平均利润，尔后形成生产价格 B．平均利润等于生产价格减去生产成本 C．无论生产价格还是平均利润，全都直接和资本相联系，同活劳动的联系已被抹煞 D．生产价格的形成是部门内部竞争的结果，平均利润的形成是部门之间竞争的结果

【多选题】： A     B     C     D

第7题： 不可能所有的苹果都是甜的。以下哪项最接近于上述断定的含义 A．所有的苹果必然都不是甜的。 B．所有的苹果可能都不是甜的 C．有的苹果可能不是甜的 D．有的苹果必然能是甜的

【单选题】： A     B     C     D

第8题：旋覆花入煎剂应 A．后下 B．先煎 C．冲服 D．包煎 E．另煎

【单选题】： A     B     C     D     E

第9题：Vienna was one of the music centers ofEurope during the classical period, and Haydn, Mozart, andBeethoven were all active there.As the (1) of the Holy RomanEmpire (which included parts of present-dayAustria, Germany, Italy, Hungary,Czech and Slovakia), it was a (2) cultural and commercial center (3) a cosmopolitan character. Its population of almost 250,000 (in 1800) made Vienna the fourth largest city inEurope.All three (4) masters were born elsewhere, but they were (5) to Vienna to study and to seek (6) . In Vienna, Haydn and Mozart became close friends and influenced each other’s musical (7) .Beethoven traveled to Vienna at sixteen to play for Mozart; at twenty-two, he returned to study with Haydn. Aristocrats from all over theEmpire spent the winter in Vienna, sometimes bringing their private (8) . Music was an important part of court life, and a good orchestra was a (9) of prestige. Many of the nobility were excellent musicians. Much music was heard in (10) concerts where aristocrats and wealthy commoners played (11) professional musicians. Mozart andBeethoven often earned money by performing in these intimate concerts. The nobility (12) hired servants who could (13) as musicians.An advertisement in the Vienna Gazette of 1789 (14) : " Wanted, for a house of the gentry, a manservant who knows how to play the violin well. " In Vienna there was also (15) music, light and popular in (16) . Small street bands of wind and string players played at garden parties or under the windows of people (17) to throw (18) money. Haydn and Mozart wrote many outdoor entertainment (19) , (20) they called divertimentos or serenades. Vienna’s great love of music and its enthusiastic demand for new works made it the chosen city of Haydn, Mozart andBeethoven. A．along B．alongside C．among D．between

【单选题】： A     B     C     D

第10题：Shopping has always been something of an impulse activity, in which objects that catch our fancy while strolling are immediately bought on a whim.Advertisers and sellers have taken advantage of this fact, carefully positioning inexpensive but attractive items on paths that we are most likely to cross, hoping that our human nature will lead to a greater profit for them. With the dawn of the Internet and its exploding use across the world, the same tactics apply. Advertisers now place "banners", links to commercial web sites decorated with attractive pictures designed to catch our eyes while browsing the webs, on key web sites with heavy traffiC、They pay top dollar for the right, thus creating profits for the hosting web site as well. These actions are performed in the hopes that during the course of our casual and leisurely web surfing, we’ll click on that banner that sparks our interest and thus, in theory, buy the products advertise D、 Initial results have been positive. Web sites report a huge inflow of cash, both from the advertisers who tempt customers in with the banners and the hosting web sites, which are paid for allowing the banners to be put in place.As trust and confidence in Internet buying increases and information security is heightened with new technology, the volume of buying is increasing, leading to even greater profits. The current situation, however, is not quite as optimistiC、Just as magazine readers tend to unconsciously ignore advertisements in their favorite periodicals, web browsers are beginning to allow banners to slip their notice as well. Internet users respond to the flood of banners by viewing them as annoyances, a negative image that is hurting sales, since users are now less reluctant to click on those banners, preferring not to support the system that puts them in place. If Internet advertising is to continue to be a viable and profitable business practice, new methods will need to be considered to reinvigorate the industry. With the recent depression in the technology sector and slowing economy, even new practices may not do the trick.As consumers are saving more and frequenting traditional real estate businesses over their Internet counterparts, the fate of Internet business is called into question. The coming years will be the only reliable indication of whether shopping on the world wide web is the wave of the future or simply an impulse activity whose whim has passe D、 The second and third paragraphs are written in order to illustrate [A] the policy Internet advertisers design to lure clientele and its outcome. [B] the process and mixed consequences of Internet advertising and shopping. [C] the biggest splash Internet advertisers have recently made in sales promotions. [D] the banners Internet advertisers take advantage of to arouse customers’ interest.

【单选题】： A     B     C     D