如图示桃花的结构，下列叙述中错误的是（　　）

已知溶液中存在Cr₂O₇^2-＋ H₂O2CrO₄^2-＋ 2H⁺的平衡，其中Cr₂O₇^2-呈橙色，CrO₄^2-呈黄色，向该平衡体系中滴加饱和NaOH溶液时，颜色的变化情况是（      ）

乙同学把刚买的矿泉水随手放在科学书上，发现“学”字变大（如图），产生这一现象的原因是（　　）

    Elizabeth lived with her six children in a small house. One winter, there was a big flood(洪水) ,and quite a few houses were washed away, but Elizabeth's house was high enough to escape it.
    Elizabeth helped one of the families which had lost everything. She shared her home until the family could build a new house. Elizabeth's friends could not understand her since she already had so many children to take care.
    "Well," Elizabeth explained to her friends, at the end of World War II, there was a poor woman in a town in England .Her husband had been killed in the war and she had a lot of children, just like me now .The day before Christmas, this woman said to her children, “We won't be able to have much for Christmas. I'm going to get just one present for us all .Now I'll go and get it. She came back with a little girl who had no parents .Here's our present, she said to her own children. The children were more than excited to get such a present. They welcomed the little girl warmly, and she grow up as their sister. I was that Christmas present."