如图所示，$\left|\overrightarrow{AB}\right|=2,$$\left|\overrightarrow{AC}\right|=1,$$\angle BAC=120°$，O为$△ABC$的内心，则$\overrightarrow{AO}·\overrightarrow{AC}$的值为(      )

A．c（Cl^﹣）＞c（NH₄⁺）＞c（H⁺）＞c（OH^﹣）      B．c（Cl^﹣）＞c（NH₄⁺）＞c（OH^﹣）＞c（H⁺）

C．c（Cl^﹣）＞c（H⁺）＞c（NH₄⁺）＞c（OH^﹣）      D．c（NH₄⁺）＞c（Cl^﹣）＞c（OH^﹣）＞c（H⁺）

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：在错的词下划一横线,并在该词下面写出修改后的词。

注意：1）每处错误及其修改均限一词;

2）只允许修改10处,多者（从第11处起）不计分。

    I will share one experience with you. With the College Entrance Examination draw near, I was filled with great anxiety. However, I couldn't be absorbed in study, resulting my failing in the examination. I got very discouraging. Just then, my teacher, Miss Zhang, approach me and said, "In life we all have moment when we can't achieve what we want it. It is natural. Don't allow those moments to weak you, but turn them into motivation to inspire you." Her words were a reminder which provided myself with constant encouragement to smile at life. Consequently, I gained what I deserved.

    So it is an optimistic attitude which matters most of all. It gives you the confidence to deal with difficulties and to achieve what you want in your life.

无论x取什么数，下列不等式总成立的是（　　）