A、<img width="85" height="17" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/01c450e5-39ea-4607-835e-ad2ef2bef075.png" />
B、<img width="123" height="22" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/f5a60a6f-b0c0-401f-b4b4-ddae9fbeb7b7.png" />
C、<img width="137" height="20" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/b658165c-4da5-4e1a-8adb-c2fe152a8126.png" />
D、<img width="86" height="18" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/257bd34c-6d3a-430d-9606-da97ad3d3ef6.png" />