下列有机化合物的分类不正确的是(　　)

    December 21st is Becky's fourteenth birthday. When she gets home after school, she sees her parents in the living room. They both say to her, “Happy birthday, dear! We have a present for you. Go and look for it in your bedroom. ”

    Becky runs to her bedroom. There is a red box on her desk. There is a card in it. The girl takes it out and reads，“Dear Becky, I'm your present. My first three letters are in the word（单词）'come'. My last two letters are in the word 'water'. My middle（中间的） three letters are in the word 'put'. What am I?”

    Becky thinks hard and then says,“Thank Dad and Mom. I know what it is, but where is it?”

    Her father and mother tell her to go to her study. There, on the desk she finds her new present.

有网友发表帖子讨论科举制时说：“自秦以来，科举兴于世，始以八股为试，学子彻夜秉读。然科举追求功禄，令学子神经麻木，岂真学识耶”对该帖子恰当的评价是

在 ①2+1=3，②4+x=1，③y²﹣2y=3x，④x²﹣2x+1中，方程有____ （填序号）

如图1，四边形ABCD中，AC⊥BD于点O，点E、F、G、H分别为边AB、BC、CD、AD的中点，连接EF、FG、GH、EH、BD分别与EF、HG相交于点M、N，AC分别与EH、FG相交于点P、Q．

（1）求证：四边形EFGH为矩形；

（2）如图2，连接FH，若FH经过点O，在不添加任何辅助线的情况下，请直接写出图中面积相等的矩形．