已知函数f(x)的图象在点M(1,f(1))处的切线方程是2x-3y+1=0,则f(1)+f'(1)=( )。
While in Scotland, he made friends with the natives there.
A.working
B.worked
C.he works
D.he is working
试阐述工业布局理论的主要观点。