A、<img width="143" height="43" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dd7f1ff9-fdfb-4a4d-af2a-39ea6aa46ee1.png" />
B、<img width="143" height="43" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/8d2cb8ed-74d6-4acb-866d-597a9daf965d.png" />
C、<img width="143" height="45" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/576af31b-eb08-402e-90aa-6e896e1470dd.png" />
D、<img width="143" height="43" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/82f5d1ef-aa13-4b75-b9f9-083106ad494a.png" />