The content of the law of exclusion is that in the same thinking process, two contradictory thoughts on the same object must be true and not false at the same time. The content of the law of contradiction is: in the same thinking process, any one thought You cannot conflict with each other, you cannot affirm an idea on the one hand, and you deny it on the other; because an idea and its negation cannot be true at the same time. According to the above definition, Which of the following violates the law of the middle row is. ["The suspect's statements in court were contradictory. He first said that the prolongation of all witnesses in the case was credible, and then said that some witnesses' testimonies were untrustworthy.", 'Dean commented on Professor Zhang\'s age and said, "Professor Zhang is 40 years old, not too young, but of all the professors in this school, Professor Zhang is the youngest. ".', 'A reporter at a conference to protect the rights of children said that it is wrong to teach children to be self-giving; later, in a lecture for parents, it was wrong to not teach children to be self-giving.', 'They think that socialist consciousness should not be instilled in the minds of young people, but they think it is wrong to deny this statement.']