Hello! My name is John. I'm a boy. I'm eleven years old. I have three friends. They are May, Peter and Xiao Mao. May is a girl. She is twelve years old. She is from Canada. Peter is a boy. He is thirteen years old. He is from China. Xiao Mao is a boy. He is two years old, He likes eating meat. Haha, he is a dog!

根据上面短文的意思判断下面的句子是否正确。

图示意我国某山区2010年-2014年不同土地利用类型径流量的变化。据图可判断（     ）

3＋3=1＋____

①x,输出它的相反数            ②求出面积为6的正方形的周长

③求出三个数a,b,c中最大的数  ④求函数 的函数的值

其中不能用条件语句来描述其算法的有(  )