1. A. The positions of real numbers $a$, $b$, and $c$ on the number line are shown in Figure 1.
Figure 1
Then the algebraic expression
$$
\sqrt{a^{2}}-|a+b|+\sqrt{(c-a)^{2}}+|b+c|
$$

can be simplified to ( ).
(A) $2 c-a$
(B) $2 a-2 b$
(C) $-a$
(D) $a$
- 1. A. C.

From the positions of real numbers $a$, $b$, $c$ on the number line, we know
$$
\begin{array}{l}
bc . \\
\text { Then } \sqrt{a^{2}}-|a+b|+\sqrt{(c-a)^{2}}+|b+c| \\
=-a+(a+b)+(c-a)-(b+c) \\
=-a .
\end{array}
$$