1, there is an implicit condition in this question, that is, Ding did not say: If I get an A, then A will get an A .... . Problem solving can probably be broken through here. That is, Ding got the best and A didn't get the best.

2.a is not necessarily excellent, and B is not necessarily excellent.

3.b may not be excellent, and D may or may not be excellent.

Ding must get the best, because the topic says that two people get the best, so according to the backward method, you have to use C to get the best.

5. If the question is 1 person gets the best score, it must be D. If two people get the best score, it must be D and C. If three people get A, it must be D, C and B.