A、<img width="72" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/7a1b96b7-67dc-485c-a9de-a274be8ea723.png" />
B、<img width="67" height="43" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/4a370091-ffe9-448a-90f5-1b137444a4c2.png" />
C、<img width="70" height="42" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/01f86ad5-717f-4cc7-8f8e-e1d569a53dec.png" />
D、<img width="70" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c6842107-6f83-41b6-b53c-2255a62555bf.png" />