A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452225302982055850_4.png" title="5259351465483381" alt="4.png"/>
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452225309570080780_5.png" title="9391816179199892" alt="5.png"/>
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452225329531088652_6.png" title="4131229964593704" alt="6.png"/>
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20160108/1452225338366013350_7.png" title="31206504345740927" alt="7.png"/>