1. The number of integer solutions to the inequality $|x|<3 \pi$ is ( ).
(A) 9
(B) 10
(C) 18
(D) 19
(E) 20
1. D.
$$
\begin{array}{l}
\text { Given }|\pi|<3 \pi \Rightarrow-3 \pi<x<3 \pi \\
\Rightarrow-9 \leqslant x \leqslant 9 .
\end{array}
$$

Therefore, $|x|<3 \pi$, there are 19 integer solutions.