单选题设f(x)的定义域是[-1，0]，则的定义域是()。A．B．[-1,0]C．D．

单选题______A．B．π．C．D．

单选题定义在R上的函数f(x)既是偶函数又是周期函数。若f(x)的最小正周期是π，且当x∈[0,]时，f(x)=sinx，则f()的值为()。

单选题设φ(x)是[0，1]上的正值连续函数，a，b为常数，则当区域D={(x，y)|x2+y2≤1}时，A．πa；B．πb；C．π(a+b)；D．

单选题In the United States, the first day-nursery was opened in 1854. Nurseries were established in various areas during the (1) half of the 19th century; most of (2) were charitable. Both in Europe and in the U. S. , the day nursery movement received great (3) during the First World War, when (4) of manpower caused the industrial employment unprecedented numbers of women. In some European countries nurseries were established (5) in munitions plants, under direct government sponsorship. (6) the number of nurseries in the U. S. also rose (7) , this rise was accomplished without government aid of any kind. During the years following the First World War, (8) , Federal, State, and local governments gradually began to exercise a measure of control (9) the day-nurseries, chiefly by (10) them and by inspecting and regulating the conditions within the nurseries. The (11) of the Second World War was quickly followed by an increase in the number of day-nurseries in almost all countries, as women were (12) called upon to replace men in the factories. On this (13) the U.S. government immediately came to the support of the nursery schools, (14) $ 6,000,000 in July, 1942, for a nursery school program for the children of working mothers. Many States and local communities (15) this Federal aid. By the end of the war, in August, 1945, more than 100,000 children were being cared (16) in day-care centers receiving Federal (17) . Soon afterward, the Federal government (18) cut down its expenditures for this purpose and later (19) them, causing a sharp drop in the number of nursery schools in operation. However, the expectation that most employed mothers would leave their (20) at the end of the war was only partly fulfilled.

单选题经过点(1，0)，且切线斜率为3x2的曲线方程是( )

单选题设，则______

单选题坐标系中M，N两条直线，位置关系如图所示，两直线方程分别表示为M：x+ay+b=0，N：x+cy+d=0，则有______．

单选题坐标平面内，与点A(1，2)距离为2，且与点B(4，0)距离为3的直线共有( )条。 (A) 1 (B) 2 (C) 3 (D) 4

单选题直线Ax+By+C=0，其中AB＜0，BC＜0，则此直线通过( )． A．第Ⅰ、Ⅱ、Ⅲ象限 B．第Ⅰ、Ⅱ、Ⅳ象限 C．第Ⅰ、Ⅲ、Ⅳ象限 D．第Ⅱ、Ⅲ、Ⅳ象限 E．原点且在Ⅰ、Ⅲ象限

单选题设A，B为n阶矩阵，现有以下命题：①A与B等价；②A与B相似；③A与B合同；④A与B为正定矩阵，用“PQ”表示命题P可推出命题Q，则()

单选题甲、乙两同学投掷一枚骰子，用字母p、q分别表示两人各投掷一次的点数。满足关于x的方程x2+px+q=0有实数解的概率为______A．B．C．D．E．以上答案均不正确