A、<img width="55" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/2e171a89-220a-429e-8ca1-e1eb1564826d.png" />
B、<img width="57" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dc71cd42-d38a-495b-bee5-84df7bfd76b4.png" />
C、<img width="59" height="40" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e7babc55-8347-42fb-a59b-c04685cb9d87.png" />
D、<img width="55" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/90371232-9b98-4705-9ba4-b848fc06b982.png" />
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