太阳系中最大的行星是（  ）。

下列关于爵士乐的表述，哪一项是不正确的（    ）

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.

如图所示边长为a的正方体浸没在密度为ρ的液体中，液体对正方体上表面的压力为F_l，液体对正方体下表面的压力为F₂．试在图中作出F_l、F₂力的示意图．证明液体对正方体上下表面的压力差△F与正方体浸没在液体中的深度无关．

The book is ________. I wrote ________ name on its cover for ________.