A、<img width="49" height="31" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/40114811-19d2-483c-a7a6-dccb5e732420.png" />
B、<img width="44" height="32" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/ca99476f-9693-475d-9b20-c46827e9790b.png" />
C、<img width="45" height="31" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/5486cf21-d9ee-4f05-ab27-33057a406257.png" />
D、<img width="53" height="31" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/8fd2e0d2-105c-4593-8cc9-8321a7ba31fa.png" />
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