打点计时器是高中物理中重要的实验仪器，图中的甲、乙两种打点计时器是高中物理实验中常用的，请回答下面的问题：
如图所示三个容器，底面积相等，若都装入相同质量的酒精，则酒精对容器底部的压强：（ ）
下列物质的分类不正确的是（ ）
阅读短文, 选择正确的答案。
The red coat is my mother's. It's very beautiful. The brown jacket is my father's. The blue pants are my brother's. They're new. The orange shorts aye my sister's. She likes them very much. The green socks are mine.
