1. Simplify $\frac{1}{4+\sqrt{59+30 \sqrt{2}}}+\frac{1}{3-\sqrt{66-40 \sqrt{2}}}$, the result is ( ).
(A) irrational number
(B) proper fraction
(C) odd number
(D) even number
\begin{array}{l}\text { - 1.D. } \\ \text { Original expression }=\frac{1}{4+\sqrt{(5 \sqrt{2}+3)^{2}}}+\frac{1}{3-\sqrt{(5 \sqrt{2}-4)^{2}}} \\ =\frac{1}{7+5 \sqrt{2}}+\frac{1}{7-5 \sqrt{2}}=-14 .\end{array}