单选题不等式x2-2x0的解集为（　）

单选题Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied'upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body. One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics. Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

单选题已知函数f(x)满足,则f(x0)=

单选题设矩阵，则下列矩阵中与A相似的为

单选题设z=ex+y；则dz|(1,1)=（）

单选题二次积分等于()．

单选题设A是m×n矩阵，r

单选题设f(x)为单调可微函数，g(x)与f(x)互为反函数，且f(2)=4，f"(2)=，f"(4)=6，则g"(4)等于______．A．B．C．D．4

单选题给出下列两个命题：①如果一条直线与一个平面垂直，则该直线与该平面内的任意一条直线垂直②以二面角的棱上任意一点为端点，在二面角的两个面内分别作射线，则这两条射线所成的角为该二面角的平面角则(　　)

单选题在一次数学考试中，某班前6名同学的成绩恰好成等差数列．若前6名同学的平均成绩为95分，前4名同学的成绩之和为388分，则第6名同学的成绩为______分．

单选题如图62所示，Rt△ABC中，∠C=90°，半圆的圆心O在AB上，AC和BC分别切半圆于E和F，AC=b，BC=a，则的半径为{{U}}{{/U}}．

单选题在下列微分方程中以y=C 1 e x +C 2 cos2x+C 3 sin2x(C 1 ，C 2 ，C 3 为任意常数)为通解的是______.

单选题设点(x 0 ，y 0 )在圆C：x 2 +y 2 =1的内部，则直线l：x 0 x+y 0 y=1和圆C______．

单选题设X～N(2，22)，Y=aX+b～N(0，1)，则a，b的可能取值为( )．

单选题快、慢两列车的长度分别为160米和120米，它们相向行驶在平行轨道上．若坐在慢车上的人见整列快车驶过的时间是4秒，那么坐在快车上的人见整列慢车驶过的时间是( )．

单选题函数y=x2-2x-3的图像与直线y=x+1交于A，B两点，则｜AB｜=（　）

单选题记不超过15的质数的算术平均数为M，则与M最接近的整数是______

单选题设f(x)=|x|，g(x)=x 2 -x，则等式f[g(x)]=g[f(x)]成立时，x的变化范围是______

单选题设函数在点处可导，则有（）

单选题从数1，2，3，4，5中随机抽取3个数字(允许重复)组成一个三位数，其各位数字之和等于9的概率为{{U}}{{/U}}．