A：质子数
B：中子数
C：电子数
D：质量数
阅读短文，判断正误。
Hello. I am Alice. I am eight. I have a dog. His name is Sam. He is brown. He is very lovely. My mother and I like him. But my father doesn't like him. Sam likes eating meat. I like too.
一个历史事实可以由若干事件构成，事件又可以由若干小事件构成，由此可以排出一系列事件的等级或层次。下列选项符合上述说法的是（ ）
小李去公园游览，想寻找景点，应该选（ ）
