I have a big family. My name is Tony Brown. I'm English. My father and mother are teachers. They teach (教) English in No.1 Middle School. I have a sister. Her name is Mona. We are students in N0.1 Middle School. My grandfather's name is David, My grandmother's name is Sue. They are retired (退休的), they are at home. Paul is my uncle. He is a worker (工人). Paul's wife (妻子)—Jane, is a doctor (医生). They have a son. His name is Jeff. He's only three.

一种饮料重约300克，罐上注有“蛋白质含量≥0.5%”，其中蛋白质的含量为____ 克．

–What do you think of this ________?
–I love it. I learned a lot about Steve Jobs after reading it.

下列实验能验证质量守恒定律的是（  ）