A、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/24a73758-548b-4586-9280-48fa27a1722c.png" />
B、<img width="13" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/c807c690-e385-4a59-b8ac-40fb91476f98.png" />
C、<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/3747752e-8ee7-41b8-81cf-9afe49473357.png" />
D、<img width="20" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/9a150ff5-611d-4796-b2a3-3b22294906a7.png" />