A、<img width="176" height="112" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/47ecab30-a54e-4e8f-ab69-74d435d34ff7.png" />
B、<img width="172" height="116" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/a8198a9c-0fc2-4708-9047-276752c6ae80.png" />
C、<img width="186" height="112" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/f0d7299a-4664-4f30-a960-5fc3dfda6b82.png" />
D、<img width="182" height="114" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/246b0b1e-74fa-4680-b2bf-82d6e99a53d2.png" />
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