单选题甲、乙、丙3位同学选修课程，从4门课程中，甲选修2门，乙、丙各选修3门，则不同的选修方案有( )． (A) 36种(B) 48种 (C)72种(D) 96种(E) 192种

单选题由21个不同的数组成的数集P，如果n∈P，且n是其他20个数的算术平均值的4倍，那么n占这21个数总和的______A．B．C．D．E．

单选题(A)I2＞I＞I1.(B)I2＞I1＞I.(C)I＞I2＞I1.(D)I＞I1＞I2.

单选题某大学学位自学考试，有六门不同的科目，允许应考学生参加其中的一项或几项考试，对于一名考生来说，接受考试的方法有( )种．

单选题在一次竞猜活动中，设有5关，如果连续通过2关就算闯关成功，小王通过每关的概率都是，他闯关成功的概率为____．

单选题某次数学考试考5道题，全班52人参加，共做对181道题，已知每人至少做对1道题，做对1道的有7人，5道全对的有6人，做对2道和3道的人数一样多，那么做对4道的人数有______

单选题若+n2+9=6n，那么直线y=kx+(m+n)一定经过()。

单选题设函数f(x)在连续，其一阶导函数除x=a外都存在，并且其一阶导函数的图形如下图所示，则f(x)

单选题设D是由直线x=-1，y=1与曲线y=x3围成的平面区域，D1是D在第一象限的部分，则等于

单选题3, k, 2, 8, m, 3 The arithmetic mean of the list of numbers above is 4. If k and m are integers and k≠m, what is the median of the list? (A) 2 (B) 2.5 (C) 3 (D) 3.5 (E) 4

单选题[2016年12月]x 2 +y 2 一ax一by+c=0与x轴相切。则能确定c的值。 (1)已知a的值； (2)已知b的值。

单选题Divorce is the act by which a valid marriage is dissolved, usually freeing the parties to remarry. In regions in (1) ancient (2) authority still predominates, divorce may be (3) and rare, especially when, as among Roman Catholics and Hindus, the religious (4) views marriage (5) indissoluble. Custom, (6) , may make divorce a simple matter in (7) societies. (8) some Pueblo Indian tribes a woman could divorce her husband (9) leaving his moccasins on the doorstep. The (10) of individual determination and mutual (11) are making divorce (12) acceptable in the (13) parts of the world. Among premodern societies, the rate of marital stability is difficult to (14) (15) the varying definitions of (16) and divorce. It seems to be broadly true (17) wherever divorce is a legal impossibility the wedding is a well-defined event conducted with (18) formality. The (19) principle does not hold true: elaborate marriage ceremonial is quite compatible with high divorce rates. Many anthropologists agree that divorce is generally more permissible in matrilineal societies (20) in patrilineal ones, in which the procreative and sexual rights of the bride are often symbolically transferred to the husband with the payment of bride-price.