8. Given the set $A=\{x|| x \mid \leqslant 2, x \in \mathbf{R}\}, B=\{x \mid x \geqslant a\}$, and $A \subseteq B$, then the range of the real number $a$ is $\qquad$.
8. $a \leqslant-2$

Analysis Since $A=\{x \mid-2 \leqslant x \leqslant 2\}, B=\{x \mid x \geqslant a\}$, and $A \subseteq B$, using the covering relationship on the number line: as shown in the figure (Question 8)
Question 8
Therefore, we have $a \leqslant-2$.
Comment This problem mainly examines the concept of sets and the relationship between sets.