声音在空气中传播时，下列叙述中正确的是（　　）

请你用自己喜欢的符号表示：

     9棵树                10条鱼                1栋房子             8把扇子

选出对划线字解析不正确的一项(  )

已知双曲线$\frac{x^2}{a^2}-\frac{y^2}{b^2}=1\left(a>0,b>0\right)$的实轴长、虚轴长、焦距长成等差数列，则双曲线的离心率e为  (   )                                                          

选词填空。

because, at, don't, favorite, get, go, have, lunch, on, teacher

    I____ up at 7:00 and____ to school at 8:00. I____science at 9:00 and then I have math at 10:00. Math is my____ subject. I like math it's interesting. Mr. Wang is my math____. I have____ at 12:00 and then I have music at 1:00, I have history____2:00. I____like history. But I really like my art class. I have an art class at 2:00____Tuesday.