某同学用三块相同的海绵和几块相同的砖做了一次实验，从中探索压强跟压力、受力面积的关系，如图所示：

其中最能说明压强跟受力面积关系的两个图是____ 

其中最能说明压强跟压力的关系的两个图是____ 

A．（甲）和（乙）图       B．（甲）和（丙）图       C．（乙）和（丙）图       D .任意两图均可

根据短文理解，选择正确答案。

    Amy was looking for a gift for her little daughter. Suddenly she stopped before a store of dolls.

    “Girls like dolls,” she thought as she was walking into it. Looking around, she saw a grandma doll - one with gray hair and a pair of glasses. In her mind appeared Joyce, her mother.

    When Amy was a little girl, she got her first doll from Joyce for her birthday. Then the second, the third...A doll a year from Joyce never arrived late. “Why always a doll?” This question had been in Amy's mind until one day her father gave the answer, Little Joyce dreamed to have a doll. Her parents promised one for her fifth birthday. Sadly, they both died in a traffic accident before it arrived. The never-received gift was the most precious in her eyes. Her mother's story being recalled(回忆) , Amy got an idea.

    It was Joyce's 60th birthday. A package was delivered(递送) to her, with a card that read:

    Dear Joyce,

    I forget to send you the package(包裹) that you should have received on May 20, 1956, your fifth birthday. The gift inside has aged, but I felt that you might still wish to have it.

    Angel of Joy

    Joyce opened the package and saw a lovely grandma doll. She held the doll that she had waited for so many years, with tears running down her face. The doll, given by “Angel of Joy”, made her the happiest “child” in the world.

下列各式：①（π﹣3.14）⁰=1；②10^﹣3=0.003；③${\left(\frac{4}{5}\right)}^{-2}={\left(\frac{5}{4}\right)}^2$；④3^﹣2=﹣3²，其中成立的有（　　）