A、<img width="54" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/691ec54a-8586-4efc-82ae-564619317e13.png" />
B、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fe302487-385b-4e5e-b984-8db1dfe198e7.png" />
C、<img width="72" height="22" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1b890984-5286-401f-89fa-20cc50c5b2d8.png" />
D、<img width="62" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/da2d9c90-cce3-4fe2-b912-64206af3e9d0.png" />
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