A、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/86c91955-9fa4-41a4-9d65-440ef6a3553e.png" />
B、<img width="13" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/0cbc0d41-366b-4c26-b651-23b264248b78.png" />
C、<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/d2513088-6028-40eb-91f3-399fc42c91c4.png" />
D、<img width="20" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/3d9910f9-cdde-4d21-b2fa-b3492854e6ad.png" />