如图，⊙O中，如果$\stackrel{\wedge }{AB}$=2$\stackrel{\wedge }{AC}$，那么（　　）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（/\），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仅限一词；不按要求方式改的不给分！2、只允许修改10处，多者（从第11处起）不计分。

    In recent years, more and more parents send their children to famous schools, thought it can ensure that their children can be admitted by better universities after graduation.

    It is true that famous schools are furnishing with better teaching facilities. What's more, teachers are excellent, that come from all over the country and even abroad. They have the ability make classes more lively and interesting, so students will be able to accept knowledge better. Besides, not every student is fit to go to famous schools where there is a fierce competition among students. And students there have to work much harder than that in ordinary schools.

    I suggest effective measures are taken to make sure all the schools provide equal good education. Only in this way can all the students have equal rights to receive quality education.

关于光谱和光谱分析，下列说法中正确的是（   ）