The value of $\frac{1998- 998}{1000}$ is

$\textbf{(A)}\ 1 \qquad \textbf{(B)}\ 1000 \qquad \textbf{(C)}\ 0.1 \qquad \textbf{(D)}\ 10 \qquad \textbf{(E)}\ 0.001$
1. Start with the given expression:
   \[
   \frac{1998 - 998}{1000}
   \]

2. Perform the subtraction in the numerator:
   \[
   1998 - 998 = 1000
   \]

3. Substitute the result back into the expression:
   \[
   \frac{1000}{1000}
   \]

4. Simplify the fraction:
   \[
   \frac{1000}{1000} = 1
   \]

Thus, the value of the given expression is:
\[
\boxed{1}
\]