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.

是否存在实数a，使函数 $f\left(x\right)={\log }_2\left(x+\sqrt{x^2+2}\right)-a$ 为奇函数，同时使函数 $g\left(x\right)=x\left(\frac{1}{a^x-1}+a\right)$ 为偶函数，证明你的结论．

一支钢笔的长约是17分米．（判断对错）

上届政府五年间，中国加快科技创新步伐。从神州七号神州十号升空，“中国高度”实现华丽转身；“蛟龙”号7062米深海下潜成功，刷新了“中国深度”。从大型飞机项目开启，到中国高铁延伸演绎着“中国速度”。科技创新能力，已越来越成为综合国力竞争的决定性因素。

关于家庭电路与安全用电，下列说法正确的是（ ）