2. If $b_{1}, b_{2}$ satisfy the inequality $\left(x-a_{1}\right)\left(x-a_{2}\right)<0$ with respect to $x$, and $b_{1}<b_{2}, a_{1}<a_{2}$, then which of the following conclusions is correct? ( ).
(A) $a_{1}<b_{1}<b_{2}<a_{2}$
(B) $b_{1}<a_{1}<b_{2}<a_{2}$
(C) $a_{1}<b_{1}<a_{2}<b_{2}$
(D) $b_{1}<a_{1}<a_{2}<b_{2}$
2.A.
$$
a_{1}<b_{1}<a_{2}, a_{1}<b_{2}<a_{2} .
$$