阅读下面的短文,在空白处填入一个适当的词,或填入括号中所给单词的正确形式。
    Peter is ____ really interesting boy. This is his tree house. It's very cool. Look! What's that next to the desk? It's Peter's dog. ____(it)name is Angelina. It's a funny dog. It can____(smile). There's a radio and some picture____(book)on the desk.  Look at the wall.  You can see a map of America and a clock on it. Peter usually____(go)to his tree house at weekends with his friends. They play games and have a good time there.

材料在人类生产、生活中有着重要的作用．下列有关材料的说法中正确的是（  ）

判断下列答案是否正确。

人们常在可燃建筑材料中添加阻燃剂以防止火灾。Mg(OH)₂是一种常见的阻燃剂，它在380℃时分解成水蒸气和耐高溢的Mg0，并吸收大量的热。下列说法错误的是（   ）

我国地形复杂多样，山脉构成地形骨架，很多山脉成为主要的地理分界线。读我国部分山脉分布示意图，完成下列各题。