The vernal equinox in February and the autumnal equinox in August are neither long nor short; There is no difference between yin and yang in three years and five years. "This couplet reflects (1) thin

The vernal equinox in February and the autumnal equinox in August are neither long nor short; There is no difference between yin and yang in three years and five years. "This couplet reflects (1) thinking and existence from one side. C

Examination analysis: vernal equinox, autumnal equinox, leap month, etc. They all reflect people's grasp and understanding of the laws of natural movement, indicating that people can understand the world, thinking can correctly reflect existence, and thinking and existence are consistent. At the same time, it also shows that our solar term changes belong to the truth, and the truth is concrete and conditional, so ① ④ is correct; (2) wrong expression; Practice is the basis of cognition, so ③ is wrong. The answer to this question is C.