下列特称命题中真命题的个数是(  )

①  $\exists x\in R,x\le 0$②至少有一个整数，它既不是合数，也不是素数

③ $\exists x\in${x|x是无理数}，x²是无理数

根据材料，请找出Jim Green为家人准备的晚餐，并填写表格。
　　 Today is my birthday. I want to thank my family for their love. So I cook the dinner for them. I know my mother likes hamburgers and broccoli. But my father likes chicken and tomato soup. I have a brother. He likes hamburgers, too. But he doesn’t like broccoli. He likes carrots. I have a sister, too. She likes fish and French fries. I like chicken and apples. I will buy these things for the birthday party.

Father: ____ 

Mather: ____

Brother:____ 

Sister: ____ 

Jim : ____ 

下图是一次小组会上讨论时的情景，请你阅读图片，回答下列问题：