DENVER (AP) — ARLINGTON, Texas (AP) — Dak Prescott and the Dallas Cowboys had another efficient preseason showing. Andy Dalton bogged down a bit with his Cincinnati Bengals. Prescott led a pair of scoring drives in three possessions, capped by a scrambling 6-yard scoring pass to Terrance Williams, before the Bengals rallied after halftime for a 21-13 exhibition victory Saturday night. The Bengals had just two first downs in three Dalton-led possessions a week after he threw for two touchdowns with an offense that was revamped after finishing last in the NFL.