在△ABC中，点P从点B出发向C点运动，运动过程中设线段AP长为y，线段BP的长为x（如图甲），而y与x的函数图象如图乙所示，Q是图象上的最低点，请观察图甲、图乙，回答下列问题：

（1）直接写出AB，BC边上的高AH.

（2）求AC的长．

当苏联政府每年国民收入的三分之一用作再投资时，这也就意味着低工资和消费品短缺。一个苏联工人的反应很典型：“他们假装给我们工资，于是我们也假装在工作。”苏联工人的话实质上反映        （    ）

阅读理解

    A beautiful and very successful actress (女演员) was the star for a new musical show. Her home was in the countryside, but she did not want to go back there every night, so she bought an expensive house in the centre of the city, got some beautiful furniture and got a man to paint the rooms in new colours.

    It was very difficult to get tickets for her show, because everybody wanted to see it. So she decided to give the painter two of the best seats. She hoped that this would make him work better for her. He took the tickets without saying anything, and she heard no more about them until the end of the month, when she got the painter's bill (帐单). At the bottom of it were these words: “ Four hours watching Miss Hall sing and dance : 3 pounds,” with this note: “ After 5 p.m. I get 15 shillings (先令) an hour instead of 10 shillings.”