At First, thE DElivEry oF Color piCturEs ovEr A long DistAnCE sEEmED impossiBlE, But, with pAinstAking EFForts AnD At grEAt ExpEnsEs, it BECAmE A rEAlity.
A、trAnsACtionB． trAnsmission
C、trAnsition
D、trAnsFormAtion