2. Class B sports events: international sports events led by relevant units of the General Administration of Sport or affiliated national individual associations, co-sponsored by local governments or entrusted by local governments.
3. Grade A, Grade B and Grade C of marathon events are grading standards formulated by international association of athletics federations (IAAF) for various track and field events, which are used to distinguish different levels of events and give them different weights and scores.
4. national english contest for college students A-level examination is suitable for graduate students. National english contest for college students Class B Grade Examination Class B is suitable for English majors and junior college students. National english contest for college students Grade C exam is suitable for non-English majors.
5. There is only one difference: different A-type exams are suitable for graduate students; Class B is suitable for undergraduates and junior college students majoring in English. Class C is suitable for non-English majors; Class D is suitable for students in sports, art and higher vocational colleges.