In Xinghua village, the children are in their prime.

① The expression is obviously wrong. Spiritual strength and material strength are different and cannot be confused. ① exclusion;

② Misexpression, national spirit is the crystallization of excellent traditional culture, ② exclusion;

③ Correct and in line with the meaning of the question, "Singing it will make people forge ahead and multiply their spirits", which shows that culture has a shaping effect on people, ③ Correct; It is correct to show that excellent culture can enhance people's spiritual strength.

Therefore, choose: d.