Analysis of test questions: This question mainly examines students' ability to solve problems by using what they have learned. Respect for materials is the only secret of doing history well. Looking at the whole material, it is not difficult to find that "determined to fight hard for fifteen years and catch up with Britain without worry" is a slogan with the brand of the times in the Great Leap Forward era, so determined to fight hard for fifteen years and catch up with Britain without worry. The background of this ballad creation is B. Great Leap Forward Movement.