Xiao Ming has to go to an English cram class outside the school every weekend. Xiao Qiang has never been to an English cram class. As a result, the English scores of Xiao Ming and Xiao Qiang in the final exam are 95 and 55 respectively. 
Xiao Gang has never been to an English tutorial class. He scored 80 points in the English test this time.
 the reason why Xiao Ming's English score is better than Xiao Qiang is that he went to an English cram class outside the school.