20. My daughter Mary is ten years old. She is in Grade Three in a primary school. She is a cute girl, but she has some strange (奇怪的) ideas sometimes.
One day she asks me, "Mom, what is your favorite subject(科目)? "I answer, "It is difficult to tell. I love singing, so music is my favorite. I am good at English, and my history teacher also says I am excellent. Well, I can say I don't like science. But science is important to us, you know, so you must do well in it. What is your favorite subject, Mary?Tell me something about your subjects, dear. " "I like Chinese. It is easy. I like English because my English teacher likes me very much. I can't stand math. It is serious(严格的)and sad. "
"Do you mean your math teacher is serious and sad?"
"No, it is math, not the math teacher. "
"Why do you think so?"
"Because math has so many problems (问题). Isn't it sad all day?"