1. Simplify:
$$
\frac{12-2 \sqrt{35}+\sqrt{14}+\sqrt{10}}{\sqrt{7}-\sqrt{5}+\sqrt{2}}=(\quad) \text {. }
$$
(A) $2 \sqrt{5}-\sqrt{2}$
(B) $2 \sqrt{7}-\sqrt{2}$
(C) $3 \sqrt{5}-\sqrt{2}$
(D) $3 \sqrt{7}-\sqrt{2}$
-1 . B.
Original expression
$$
\begin{array}{l}
=\frac{2 \sqrt{7}(\sqrt{7}-\sqrt{5}+\sqrt{2})-\sqrt{2}(\sqrt{7}-\sqrt{5}+\sqrt{2})}{\sqrt{7}-\sqrt{5}+\sqrt{2}} \\
=2 \sqrt{7}-\sqrt{2} .
\end{array}
$$