A、<img width="304" height="20" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/e8b7080d-9cfe-445f-8d3b-05cc4245638a.png" />
B、<img width="280" height="22" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/e821215a-6002-427e-8a9f-900e0617c74f.png" />
C、<img width="312" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/75c55ece-3d52-4cbc-8926-fef4ee813f87.png" />
D、<img width="288" height="22" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/5005ae59-922c-4b4e-a1a0-6d87a687c5f1.png" />
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