19.The public transport system in many cities in the world_______by the local authority.
题目
19.The public transport system in many cities in the world_______by the local authority.
A.is still ran
B.are still run
C.are still ran
D.is still run
答案
d
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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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