写出反义词。

清晨—____              竖起—____                 高兴—____

定义函数$y=f\left(x\right),x\in D$，若存在常数c，对任意$x_1\in D$，存在唯一$x_2\in D$的，使得$\frac{f\left(x_1\right)+f\left(x_2\right)}{2}=c$，则称函数f(x)在D上的均值为c，已知$f\left(x\right)=lgx,x\in 10,100$，则函数$f\left(x\right)=lgx$在$x\in 10,100$上的均值为（   ）

①取少量样品加入足量水仍有部分固体未溶解：再加入足量稀盐酸，有气泡产生，固体全部溶解；

②取少量样品加入足量稀硫酸有气泡产生，震荡后仍有固体存在．

该白色粉末可能为（  ）

Katie: Hi, Alex. We are having fun at the beach.

Alex: What ____ everyone ____ (do)?

Katie:Ted          ____ (play) volleyball with Carol. Jenny and Henry____ (play) badminton. Grace ____ (fish). Ivan ____(swim) in the sea. Laura and Johnny____(lie) on the beach. Laura____(eat) an ice cream too. Jim  ____ (play) the guitar. And I ____ (talk) to you on the phone.