A、<img width="53" height="25" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/5041383b-e62b-4de5-acf2-000ce79b3e28.png" />
B、<img width="78" height="43" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/bb9517ee-602a-4468-9aa3-fd3c93b62571.png" />
C、<img width="75" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/46e4e8ac-3cea-4994-8a66-35350ca1443d.png" />
D、<img width="64" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c51efa0e-8c4b-4874-952d-06f1bb2abf53.png" />
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