A、<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/296732cc-cd31-49ae-8f0e-36f316563b73.png" />
B、<img width="20" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/13194a92-8cd6-4280-b260-93474c166917.png" />
C、<img width="20" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/91d3c0e9-5f86-483f-a18b-6493ea823357.png" />
D、<img width="20" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/ea88bb3e-a13f-4ef5-9cec-327ac509a0b7.png" />
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