A、<img width="128" height="33" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6ab051be-0620-4b91-96d2-52fa86fd2c9f.png" />
B、<img width="181" height="40" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3d500113-0459-488c-901b-eea2a7d0b074.png" />
C、<img width="228" height="45" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/174b498e-0a1c-494b-8a18-b0eae8d464a9.png" />
D、<img width="250" height="45" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/ec3b7353-e7de-40e9-ad08-8d51904ee94c.png" />
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