Truth opposes all traditions and authority.

Test analysis: This question examines the truth. (1) the wrong point of view has been constantly overthrown, but it has been continuously developed and improved in practice. The wrong viewpoint is also wrong, and it is beyond historical conditions. Truth is restricted by objective historical conditions. The stem of the question says that "truth is the product of time, not authority", which shows that truth is concrete and conditional, and it must stand the test of practice, so ② ③ meets the meaning of the question, so the answer should be.

Comments: This title is binary combination multiple choice questions. The simplest solution is to eliminate errors or irrelevant options. This topic is to eliminate mistakes. ① The wrong viewpoint is not constantly overthrown in the process of understanding, but constantly developed and perfected in practice. The wrong viewpoint is also wrong, which goes beyond the historical conditions. Truth is restricted by objective historical conditions, and the difficulty of this question is moderate.