化简求值:
( I ) $27^{\frac{2}{3}}-\sqrt{(-3)^2}+\log _3 36-2 \log _3 2$;
(II) 已知 $\tan \alpha=\frac{1}{2}$, 求 $\frac{13 \cos (-\alpha)-2 \cos \left(\frac{\pi}{2}-\alpha\right)}{\sin \left(\frac{\pi}{2}+\alpha\right)+3 \sin (\pi+\alpha)}$ 的值.
$\text{A.}$
$\text{B.}$
$\text{C.}$
$\text{D.}$