21. The structure of the passage can best be described as an interview in which the interviewee:

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Based on the understanding of the whole article, use the method of elimination to answer the questions.

Item A: It is said that the interviewee defended himself in the face of the interviewer's sharp comments, which does not match the original text.

Item B: It is said that the interviewee challenged the interviewer and asked him to ask himself relevant questions. The original text did not reflect that the interviewee was actively challenging the interviewer.

Item C: It is said that the interviewee throws the question back to the interviewer, causing a relatively casual answer. Visitors are answering questions.

So choose D, the original text is indeed a lot of abstract and complicated answers.