1. According to the query of official website of China Sports Center, the effective criteria for a single running exercise are: the mileage of boys is 2.0km, the running pace is within the range of 3-9min/km, the girls 1.6km, and the running pace is within the range of 3-9min/km. For boys, the accumulated mileage of this semester reaches 120km or above, and for girls, the total score of sports reaches 100km or above plus 2 points, and the total score of physical education class does not exceed 100.
2. A semester refers to a class unit in a school year. Different countries have different semester systems. The common semester system includes two semesters, three semesters and four semesters.