1. Given the set $M=\{1,2, \cdots, 10\}, A$ is a subset of $M$, and the sum of the elements in subset $A$ is 8. Then the number of subsets $A$ that satisfy this condition is ( ) .
(A) 8
(B) 7
(C) 6
(D) 5
- 1. C.

Notice that, the subsets $A$ whose elements sum to 8 are
$$
\{8\} 、\{1,7\} 、\{2,6\} 、\{3,5\} 、\{1,2,5\} 、\{1,3,4\} \text {, }
$$

a total of 6.