A.x=1为无穷间断点Bx=1,x=2都是无穷间断点C.x=2是可去间断点D.x=1为可去间断点x=2为无穷间断点6.设\lim _{x \rightarrow \infty }(1- \frac {a}{x})^{x}=e^{3},则a=()A.3B.-3C.\frac {1}{3}D.- \frac {1}{3}7.下列方程在[0,1]有实根的有()A.\sin x+x- \frac {1}{2}=0B.x^{2}+3x+1=0C.\arcsin x+3=0D.x- \sin x+\frac {1}{2}=08.设f(x)是可导函数,且\lim _{h \rightarrow 0} \frac {f(x_{0}+2h)-f(x_{0})}{h}=1,则f'(x_{0})=()A.1B.0C.2D.\frac {1}{2}9.曲线x^{2}y+\ln y=1在点(1,1)处的切线斜率是()A.-2B.-1C.- \frac {1}{2}D.010.下列函数在x=0处可导的是()A.y= \mid 3 \sin x \midB.y=3 \ln xC.y= \mid 5x \midD.y= \mid 6 \cos x \mid11.函数y=y(x)由参数方程\cases {x=2te^{t}+1, \cr y=t^{3}-3t.}确定，\frac {d^{2}y}{dx^{2}} \mid _{x=1}=()A.\frac {3}{4}B.\frac {3}{2}C.\frac {3}{8}e^{2}D.\frac {3}{8}e12.f(x)在点x0可导是f(x)在点x0可微的()条件.A.充分B.必要C.充分必要D.以上都不对13.已知y= \cos x,则y^{(8)}=()高等数学模拟题（一）说明:考试时间120分钟,试卷共150分。题号二三四五总分分数一、单项选择题(每小题2分，共60分。在每个小题的备选答案中选出一个正确答案，并将其代