A、<img width="110" height="40" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/af80c5ea-0dab-4d69-9a24-a0942e803091.png" />
B、<img width="111" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/7e17bec5-61c9-4cac-9772-1c5acecdd0f7.png" />
C、<img width="109" height="40" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/eeb04535-3595-4ae5-ae81-ac50bbb8faaf.png" />
D、<img width="109" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/44caefee-3fc1-445f-ba6a-a2215b84feb1.png" />
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