The quality of teaching can make a huge difference to students’ academic performance. and therefore, parents prefer to choose prestigious schools for children.
请问老师，这个句子and therefore前面应该用逗号吗？还是说应该用句号 ，同时And要大写？

   【答】这个句子and therefore前面应该用逗号，不应该用句号。例如：The new boots are lighter and softer, and therefore more comfortable to wear. 新靴子更轻更软，因此穿起来也更舒服。（摘自《麦克米伦高阶英汉双解词典》p.2178）