3. The vector sets $M=\{\boldsymbol{a} \mid \boldsymbol{a}=(-1,1)+x(1,2), x \in \mathbf{R}\}, N=\{\boldsymbol{a} \mid \boldsymbol{a}=(1,-2)+x(2,3), x \in \mathbf{R}\}$, then $M \cap N=$
A. $\{(1,-2)\}$
B. $\{(-13,-23)\}$
C. $\{(-1,1)\}$
D. $\{(-23,-13)\}$
3. B If $\boldsymbol{a}=\left(a_{1}, a_{2}\right) \in M \cap N$, then $\left\{\begin{array}{l}a_{1}=-1+x_{1} \\ a_{2}=1+2 x_{1}\end{array}\right.$ and $\left\{\begin{array}{l}a_{1}=1+2 x_{2} \\ a_{2}=-2+3 x_{2}\end{array}\right.$, solving yields $a_{1}=-13, a_{2}=-23$.