"Well frogs can't talk to people in the sea, but they are confined to emptiness; Summer insects can't talk to the ice, but they are also in time. " The philosophy contained in this sentence is that (1) people's understanding is realized. A

Analysis of test questions: The famous saying of the stem describes that there would be no corresponding consciousness without encountering such an environment, which shows that matter determines consciousness, and consciousness is a reflection of matter, which conforms to the meaning of the question; This also shows that it is difficult to have a corresponding understanding without experiencing such a thing, indicating that practice determines understanding and understanding is limited by the level of practice. ① It conforms to the meaning of the question; The material does not reflect the reaction of consciousness, and ③ it is not selected; It does not reflect the replacement of old and new things, and 4 does not choose. The answer is a.