(1) Let the set $M=\left\{x \left\lvert\, x=\frac{7}{6} \pi+2 k \pi\right.\right.$ or $\left.x=\frac{5}{6} \pi+2 k \pi, k \in \mathbf{Z}\right\}$, $N=\left\{x \left\lvert\, x= \pm \frac{7}{6} \pi+2 k \pi\right., k \in \mathbf{Z}\right\}$, then the relationship between $M$ and $N$ is ( ).
(A) $M \subseteq N$
(B) $N \subseteq M$
(C) $M=N$
(D) None of the above
(1) C