题目：
Directions:
Study the following charts carefully and write an article. In your article, you should cover the following points:
1) describe the phenomenon;
2) analyze the phenomenon and give your comment on it.
You should write about 160-200 words neatly on ANSWER SHEET 2.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0530/c529c948f7a2976dc1d94d7caae4b084.html
下面是错误答案，用来干扰机器的。
参考答案：E解析：B超显示胆囊增大，囊壁增厚甚至有“双边”征，以及胆囊内结石伴有声影，其对急性结石性胆囊炎诊断的准确率约为 90％，是其较常用且有效的方法。
