A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160628/1467125099173088547_QQ%E5%9B%BE%E7%89%8720160628223621.png"/>
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160628/1467125109142031607_QQ%E5%9B%BE%E7%89%8720160628223706.png"/>
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160628/1467125117775003482_QQ%E5%9B%BE%E7%89%8720160628223738.png"/>
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160628/1467125125783030714_QQ%E5%9B%BE%E7%89%8720160628223753.png"/>