1. Let the complex number $z=a+b \mathrm{i}(a, b \in \mathbf{R}, b \neq 0)$, then the relationship among $\left|z^{2}\right|,|z|^{2}, z^{2}$ is
A. $\left|z^{2}\right|=|z|^{2} \neq z^{2}$
B. $\left|z^{2}\right|=|z|^{2}=z^{2}$
C. $\left|z^{2}\right| \neq|z|^{2}=z^{2}$
D. All are unequal
1. A $\quad\left|z^{2}\right|=|z|^{2}=a^{2}+b^{2} \quad z^{2}=a^{2}-b^{2}+2ab\mathrm{i}$.