人体由八大系统组成，有些器官属于甲系统，也属于乙系统；而有些器官则只属于甲系统而不属于乙系统．据此判断，下列哪种器官不同于其他三种器官？（ ）

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；

2）只允许修改10处，多者（从第11处起）不计分。

    Alice, my best friend, devotes many energy to her lessons. She is always one of the top student in our class. She loves the music so much that she made it a rule to enjoy songs in her spare time. Alice is always willing to help other, and she often helps us with our lessons. As a volunteer, she has successful organized some voluntary activities. We paid a visit a nursing home last month, so we picked up rubbish near our school. That we did was warmly welcomed. Win honour for our school, Alice is admired by our classmates.