单项选择题

Lucy is a girl from America. She now studies in China. She finds the lessons in China are very different from the ones in America. When she came to China, she found it a little difficult to learn all the lessons except English because they were in Chinese and she couldn’t understand it well. But now she is good at all the lessons. She studies hard. After class she talks with students in Chinese and the students help her with her Chinese. She is happy to study in China.
But she also finds students in China spending a longer time at school than the students in America do. Students like football better than American football. She likes playing American football, but nobody plays with her because they can’t. So she decides to teach her classmates. She is sure they can play with her soon.
What’s the difference between Chinese students and American students