单选题如果多项式f(x)=x3+px2+qx+6有一次因式x+1和，那么另外一个一次因式是()．

单选题如图所示，矩形ABCD的对角线BD过坐标原点O，矩形的边分别平行于坐标轴，点C在反比例函数的图像上。若A点的坐标为(-2，-2)，则k=______。A．2B．1C．0D．-1

单选题设f(x)连续，且f(1)=1，则______A．1B．-1C．D．

单选题设f(x)在x=0处二阶可导，f(0)=0，且则______

单选题把四封不同的信投入三个不同的邮箱，且每个邮箱至少投一封信，共有( )种投法．

单选题设随机变量X的分布函数为F(x)，已知且其概率密度f(x)=af1(x)+bf2(x)，其中f1(x)，f2(x)分别是正态分布N(0，σ2)与参数为λ的指数分布的概率密度，则

单选题一批产品的合格率为95%，而合格率中一等品占60%，其余为二等品，现从中任取一件检验，这件产品是二等品的概率为______．

单选题设A、B、C为事件，P(ABC)＞0，如果P(AB|C)=P(A|C)P(B|C)，则

单选题某产品的产量Q与原材料A、B、C的数量x、y、z(单位均为吨)满足Q=0.05xyz，已知A、B、C的价格分别是3、2、4(百元)．若用5400元购买A、B、C三种原材料，则使产量最大的A、B、C的采购量分别为______吨．

单选题某地召开有关《红楼梦》的小型学术研讨会。与会者中，4个是北方人，3个是黑龙江人，1个是贵州人；3个是作家，2个是文学评论家，1个是教授；以上提到的是全体与会者。 根据以上陈述，参加该研讨会的最少可能有几人?最多可能有几人? A．最少可能有4人，最多可能有6人。 B．最少可能有5人，最多可能有11人。 C．最少可能有6人，最多可能有14人。 D．最少可能有8人，最多可能有10人。 E．最少可能有6人，最多可能有11人

单选题______．A．2B．1C．D．0

单选题设三阶常系数齐次线性微分方程有特解y1=ex，y2=2xex，y3=3e-x，则该微分方程为()

单选题某人射击5枪，命中3枪，3枪中恰有2枪连中的概率为()．

单选题设f(x)在闭区间[0，1]连续，则曲线y=f(x)与直线x=0，x=1和y=0所围成的平面图形的面积等于______。A．B．C．D．不确定

单选题设函数内连续，且，则常数a，b满足

单选题展开式中的常数项是()．A．12B．20C．-12D．-20

单选题下列表中可成为离散型随机变量的分布列的是A．B．C．D．

单选题"It is an evil influence on the youth of our country. " A politician condemning video gaming? Actually, a clergyman denouncing rock and roll 50 years ago. But the sentiment could just as easily have been voiced by Hillary Clinton in the past few weeks, as she blamed video games for "a silent epidemic of media desensitisation" and "stealing the innocence of our children". The gaming furore centers on "Grand Theft Auto: San Andreas", a popular and notoriously violent cops and robbers game that turned out to contain hidden sex scenes that could be unlocked using a patch downloaded from the internet. The resulting outcry (mostly from Democratic politicians playing to the centre) caused the game's rating in America to be changed from "mature", which means you have to be 17 to buy it, to "adults only", which means you have to be 18, but also means that big retailers such as Wal-Mart will not stock it. As a result the game has been banned in Australia; and, this autumn, America's Federal Trade Commission will investigate the complaints. That will give gaming's opponents an opportunity to vent their wrath on the industry. Skepticism of new media is a tradition with deep roots, going back at least as far as Socrates' objections to written texts, outlined in Plato's Phaedrus. Socrates worried that relying on written texts, rather than the oral tradition, would "create forgetfulness in the learners' souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves." (He also objected that a written version of a speech was no substitute for the ability to interrogate the speaker, since, when questioned, the text "always gives one unvarying answer". His objection, in short, was that books were not interactive. Perhaps Socrates would have thought more highly of video games. ) Novels were once considered too low-brow for university literature courses, but eventually the disapproving professors retired. Waltz music and dancing were condemned in the 19th century; all that twirling was thought to be "intoxicating" and "depraved", and the music was outlawed in some places. Today it is hard to imagine what the fuss was about. And rock and roll was thought to encourage violence, promiscuity and Satanism ; but today even grannies buy Coldplay albums.

单选题下列结论正确的是

单选题设集合M={1，2，3，4，5}，N={2，4.6}，则M∩N=（　）