增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改仅限1词；

2). 只允许修改10处，多者(从第11处起)不计分。

    Mr. Turner turned over in bed from time to time in last night, for he was so excited that he could not fall sleep. Yesterday morning, he went to a big gardening company, knowing as Green Fingers, for the interview. Mr. Turner, who liked to help his grandfather grew flowers in the garden, looking forward to the job offered by the company. When he got the company, he found there were many people waiting and he had no ideas whether he could get the job. While waiting, he helped the workers there to remove the fallen trees and clear the road. Luckily, he was the only one who finally got the job, so the manager decided to give the job to whomever he believed was helpful.

下列加线的字注音有误的一项是（      ）

在△ABC中，角A，B，C的对边分别为a，b，c，且$\frac{2b-\sqrt{3}c}{\sqrt{3}a}=\frac{\cos C}{\cos A}$．

（1）求角A的值；

（2）若∠B=$\frac{\mathrm{\pi }}{6}$，BC边上中线AM=$\sqrt{7}$，求△ABC的面积．

材料一：草履虫不喜欢二氧化碳浓度高的环境，当草履虫在游动过程中偶然靠近水中的一个二氧化碳气泡时，由于气泡酸性太强，它就停止游动，然后向后游，转动大约30度的角度后，再向前游，如果又游到

距气泡太近的地方时，它便重复上述的移动次序，最后聚集在离气泡较远的微酸性区域。

材料二：成年的黑猩猩会利用经验来解决问题,当香蕉被挂到高处够不到时,黑猩猩就会把几个木箱堆叠起来,然后爬到木箱顶上去摘香蕉。