The correct answer is 'Even if it has no immediate practical value, it is important for deepening one's thinking and enriching one's life in the long run.' The author states that 'within this 'useless' knowledge lies great value that enriches us as human beings,' and describes it as a 'mental detour.' This emphasizes its value from a long-term perspective in terms of deepening thought and enriching life, rather than short-term practicality.
The other options are incorrect for the following reasons:
- 'It is a waste of time, so one should prioritize learning practical knowledge.': This is the 'common societal view' that the author refutes at the beginning of the passage; it is the opposite of the author's argument.
- 'Since it can lead to new ideas, it should ultimately be studied for the purpose of financial gain.': The author states that it 'may not yield immediate financial benefits' and highlights inner enrichment and deeper thinking as its value, rather than financial gain. The purpose is different.
- 'Like calligraphy, it only has the potential to lead to great success in specific fields.': Calligraphy is just one example. The author also mentions philosophy and insect ecology to argue for the value of 'useless' knowledge in a more general sense.