1. Simplify
$$
|2-x|+(\sqrt{x-2})^{2}-\sqrt{4 x^{2}-4 x+1}
$$

The result obtained is ( ).
(A) $1-2 x$
(B) $5-4 x$
(C) 3
(D) -3
1. D.
From the condition, we know $x-2 \geqslant 0 \Rightarrow x \geqslant 2$.
Therefore, the original expression $=(x-2)+(x-2)-(2 x-1)=-3$.