A

Test question analysis: This question is based on Chinese poetry, songs, famous sayings and aphorisms as the background. The title points to "Both of them contain the philosophy of qualitative change caused by quantitative change." In option A, "Thousands of sifting through thousands of filtrations is hard, but only after blowing away all the sand can you find gold." It means that panning for gold requires thousands of filtrations. Although it is hard work, only when all the silt is sifted out, will the shining gold be revealed. "Perseverance can carve out gold and stone" means that as long as you keep carving with a knife, even metal and jade can be carved with floral decorations. The extended meaning is: As long as you persist in your efforts, you can do even the most difficult things. Both contain the philosophy that quantitative change leads to qualitative change, and A is in line with the meaning of the question. The two sentences in option B reflect people's consciousness and mood, but they do not reflect the philosophy that quantitative changes lead to qualitative changes. The first sentence in option C means that the article is a career passed down through the ages, and only the author himself knows the pros and cons, and it does not reflect the qualitative changes caused by quantitative changes. Option D, "Indiscriminate flowers gradually become charming, only Asakusa has no horse hooves" reflects the need to see the essence through the phenomenon.