(1) For the sequence $\left\{a_{n}\right\}$, the sum of the first $n$ terms $S_{n}=n^{2}-2 n$, then $a_{3}+a_{17}$ equals ( ).
(A) 36
(B) 35
(C) 34
(D) 33
(1) C Hint: When $n>1$, $a_{n}=S_{n}-S_{n-1}=2 n-3$, so $a_{3}$ $a_{17}=34$.