A、<img width="61" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/47564c86-b2d3-416d-990d-17fa921c3b9b.png" />
B、<img width="49" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/d42c60ed-3f6f-4da4-b055-2704c3b02fee.png" />
C、<img width="57" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/95147730-9969-4d77-9a3e-a5e21d6ff3a6.png" />
D、<img width="57" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/29a2eb40-ed7f-48eb-8cfa-e4a9e5258155.png" />
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