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"/>
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