圆柱体积是圆锥体积的3倍，这两者一定是等底等高。
解决水资源地区分布不均的直接且有效的办法是（ ）
摸____ 笼____ 魔____ 术____
膜____ 聋____ 磨____ 述____
There are seven ______ in the picture.
The teacher speaks very loudly ___ all the students can hear her.
