如图是由几个相同的小立方块搭成的几何体的三视图，则这个几何体的小立方块的个数是（　　）

    Jackie Chan was born on April 7, 1954, in Hong Kong, China. His parents left mainland China for Hong Kong a short time before he was born. His parents named him “Chan Kong-sang”, which means “born in Hong Kong”. They wanted to celebrate a safe trip to Hong Kong.
    At first, Jackie's family lived in the French Embassy(大使馆).His father was a cook, and his mother was a housekeeper. When Jackie was seven years old, his family moved to Australia. His father got a job in the American Embassy. Later, back in Hong Kong, Jackie's father sent him to the China Drama Academy. Jackie studied and worked 19 hours a day. The students practiced Kong Fu and learned how to do many stunts(特技表演)there.
     When Jackie was 17, he began to do dangerous stunts for films. In the early 1980s, Jackie went to Hollywood, but he wasn't very successful. He went on to make films in Hong Kong and had great success. Finally, in 1995,Jackie Chan became famous in the United States. Today, Jackie Chan has both Chinese and American fans and his films make millions of dollars.

青海玉树地震、四川雅安地震，使我们中国人更加团结，当时水源遭到严重污染，自然界中的水本来就含有各种杂质，因此灾区中的水也就含有更多的杂质了，污染水可以用不同的方法进行净化．下面是刘星同学设计的净水方法：

上图所示 是用空饮料瓶、带导管的单孔胶塞、蓬松棉、纱布、活性炭、小卵石、石英沙等材料自制的一个简易净水器．①根据上述净化材料的特性，B层最好放置____；其中小卵石、石英沙的作用是____；如果将石英沙与小卵石的位置颠倒是否可以，为什么?____．②该净水器不同位置的纱布所起的主要作用不同，其中第二层纱布的作用是：____．③你认为上述简易净水器（填“可以”或“不可以”）____将硬水变成软水．

函数 $y=a{x}^2+bx+c$ 图像的大致位置如图所示，则ab，bc，2a+b， ${\left(a+c\right)}^2-b^2$ ， ${\left(a+b\right)}^2-c^2$ ，b²-a² 等代数式的值中，正数有（   ）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧), 并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改： 在错的词下划一横线, 并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处, 多者(从第11处起) 不计分。

    At a sports meet of high school I knew Christie and we became best friend. At that time, we often spend time together. Under her help, I made great progress in my study. Last year, she decided to study in abroad. In other words, we would be separated for long time. Before she leaving , I prepared a gift to show my best wishes to him. She said it was the best gift she has ever had. Until then, we've kept in touch with each other through e-mails. I look forward to see her again in the near future.