把两个相同的长都是20厘米的长方体拼成一个大长方体，表面积减少了32平方厘米．原来1个小长方体的体积是多少？

仔细阅读以下材料，分析并回答下列问题：

材料一：随着“江北水域”积极推进“生态城市”的建设，生态环境得到了进一步的改善，每到冬季来临之前，东昌湖又见野鸭归来．誉有“喜鹊之乡”的东阿县鹊巢星罗密布，鹊声悦耳动听，已成为一道亮丽的风景线．

材料二：蚕农发现，雌雄蛾从茧中钻出来，必须在很短的时间内爬到一起交配，否则，因寿命短暂会失去传宗接代的机会，雌雄蛾能在较短的时间内爬到一起，完全是靠它们之间释放“气味”和闻到的“气味”实现的．

材料三：随着人类对野生动物保护意识的增强和对动物行为研究工作的深入，人们发现很多野生动物在人工饲养条件下一些重要行为丢失，如野马只会在水槽中饮水，为了恢复野马在野生条件下的饮水能力，把原先导水入槽的橡胶管拉向水坑，一步步诱导野马去水坑饮水，从而恢复野马的野外生存能力．

下列国家中，属于发达国家的是（     ）

 从下面方框中选择适当的词填入短文中，使短文通顺正确（注意有些词要用适当的形式）。

    One day, Mr. White told the class to get ready for a hobby show. The students ____  the whole morning getting what they were going to show.
     All the students came back on time but Bob, the laziest ____ in his classmates' eyes. It seemed that it was very ____  for Bob to have a hobby. But to their surprise, Bob came back with many ____ stamps in his hand. Mr. White was very happy after watching them. However, Bob was going to ____ them back.
“Bob, you can't take them back until the others watch them this afternoon,” said Mr. White.
“But I am sorry they are my brother’'s,” he answered. “He doesn't want them to be out of our home for long. He's afraid that they will be ____  .”
“Bob, you should show some of your own ____  here, not someone else's. Mr. White became kind of angry.
But Bob's words made him even ____ . “Mr. White, it's true that I have a hobby. My hobby is watching my brother collecting stamps.”