题目

The number one game in the app chart Draw Something has been sold out.The drawing game by company OMGPOP is now top spot in the Apple and Android charts in 84 countries.US company Zynga is reported to have paid $200m (£120m) for the app.Players draw pictures on their mobiles competing against each other, guessing what the pictures are from drawing clues.Head of Zynga Mark Pincus said once: The OMGPOP team has created a game that's fun and expressive.The app has become such a big hit in the gaming world in the last few weeks. It has knocked off long running Zynga titles Words with Fri一双链DNA分子，在复制解旋时，一条链上的G变成C，则DNA分子经n次复制后，发生差错的DNA占 A.1/2　　　　  B.1/2n－1　　　　 C.1/2n　　　　　　 D.1/2n+1