根据对话内容，选择正确答案。

Linda: Hello, my name is Linda Brown. What's your name?
Tony: I am Tony Smith. Nice to meet you!
Linda: Nice to meet you, too (也)! What is this?
Tony: Oh, it is a photo of my family.
Linda: Is this your mother?
Tony: Yes.
Linda: Is he your father?
Tony: Yes, he is.
Linda: And is the baby (婴儿) your brother?
Tony: Haha, it isn't. It is my sister.

两支相同的试管装入质量相等的两种不同液体，如图3所示，它们液面齐平，甲、乙两液体的密度相比（   ）

把3块月饼，平均分给4个人，每人分得总数的几分之几？每人分到多少块月饼？

— Please take a seat. The speech is going to start.

—Oh, I'm looking for my seat.

图1                        图2                        图3