A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452230347709094310_2.png" title="668436730620344" alt="2.png"/>

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452230351897055550_3.png" title="2782150877487519" alt="3.png"/>

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452230355983035010_4.png" title="79063914717174775" alt="4.png"/>

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452230360117004400_5.png" title="5162528537895913" alt="5.png"/>