he devoted his whole life to ____ the children in the poor mountainous district.
题目
he devoted his whole life to ____ the children in the poor mountainous district.
A.taught
B.teaches
C.teaching
D.teach
答案
C
to 是介词
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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