B. Find the sum of each pair of five distinct real numbers. If the smallest two sums are $20$ and $200$, and the largest two sums are 2014 and 2000, then the range of the smallest number $a$ among these five numbers is $\qquad$
B. $-793<a<10$.

Let the five numbers in ascending order be $a, b, c, d, e$. Then, among the ten sums of these numbers taken two at a time, the smallest two are $a+b, a+c$, and the largest two are $d+e, c+e$.
Hence, $a+b=20, a+c=200$,
$$
d+e=2014, c+e=2000 \text {. }
$$

Solving these equations, we get
$$
\begin{array}{l}
b=20-a, c=200-a, \\
e=2000-c=2000-(200-a)=1800+a, \\
d=2014-e=2014-(1800+a)=214-a .
\end{array}
$$

From the problem, we know
$$
\begin{array}{l}
a<20-a<200-a<214-a<1800+a \\
\Rightarrow-793<a<10 .
\end{array}
$$